NFTBench 0.9.0 preview (part 8)

third_party/real_code/rc16/sources/lib/tokenbound/lib/openzeppelin-contracts/contracts/token/ERC721/ERC721.sol

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+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC721/ERC721.sol)
+
+pragma solidity ^0.8.0;
+
+import "./IERC721.sol";
+import "./IERC721Receiver.sol";
+import "./extensions/IERC721Metadata.sol";
+import "../../utils/Address.sol";
+import "../../utils/Context.sol";
+import "../../utils/Strings.sol";
+import "../../utils/introspection/ERC165.sol";
+
+/**
+ * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
+ * the Metadata extension, but not including the Enumerable extension, which is available separately as
+ * {ERC721Enumerable}.
+ */
+contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
+    using Address for address;
+    using Strings for uint256;
+
+    // Token name
+    string private _name;
+
+    // Token symbol
+    string private _symbol;
+
+    // Mapping from token ID to owner address
+    mapping(uint256 => address) private _owners;
+
+    // Mapping owner address to token count
+    mapping(address => uint256) private _balances;
+
+    // Mapping from token ID to approved address
+    mapping(uint256 => address) private _tokenApprovals;
+
+    // Mapping from owner to operator approvals
+    mapping(address => mapping(address => bool)) private _operatorApprovals;
+
+    /**
+     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
+     */
+    constructor(string memory name_, string memory symbol_) {
+        _name = name_;
+        _symbol = symbol_;
+    }
+
+    /**
+     * @dev See {IERC165-supportsInterface}.
+     */
+    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
+        return
+            interfaceId == type(IERC721).interfaceId ||
+            interfaceId == type(IERC721Metadata).interfaceId ||
+            super.supportsInterface(interfaceId);
+    }
+
+    /**
+     * @dev See {IERC721-balanceOf}.
+     */
+    function balanceOf(address owner) public view virtual override returns (uint256) {
+        require(owner != address(0), "ERC721: address zero is not a valid owner");
+        return _balances[owner];
+    }
+
+    /**
+     * @dev See {IERC721-ownerOf}.
+     */
+    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
+        address owner = _ownerOf(tokenId);
+        require(owner != address(0), "ERC721: invalid token ID");
+        return owner;
+    }
+
+    /**
+     * @dev See {IERC721Metadata-name}.
+     */
+    function name() public view virtual override returns (string memory) {
+        return _name;
+    }
+
+    /**
+     * @dev See {IERC721Metadata-symbol}.
+     */
+    function symbol() public view virtual override returns (string memory) {
+        return _symbol;
+    }
+
+    /**
+     * @dev See {IERC721Metadata-tokenURI}.
+     */
+    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
+        _requireMinted(tokenId);
+
+        string memory baseURI = _baseURI();
+        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
+    }
+
+    /**
+     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
+     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
+     * by default, can be overridden in child contracts.
+     */
+    function _baseURI() internal view virtual returns (string memory) {
+        return "";
+    }
+
+    /**
+     * @dev See {IERC721-approve}.
+     */
+    function approve(address to, uint256 tokenId) public virtual override {
+        address owner = ERC721.ownerOf(tokenId);
+        require(to != owner, "ERC721: approval to current owner");
+
+        require(
+            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
+            "ERC721: approve caller is not token owner or approved for all"
+        );
+
+        _approve(to, tokenId);
+    }
+
+    /**
+     * @dev See {IERC721-getApproved}.
+     */
+    function getApproved(uint256 tokenId) public view virtual override returns (address) {
+        _requireMinted(tokenId);
+
+        return _tokenApprovals[tokenId];
+    }
+
+    /**
+     * @dev See {IERC721-setApprovalForAll}.
+     */
+    function setApprovalForAll(address operator, bool approved) public virtual override {
+        _setApprovalForAll(_msgSender(), operator, approved);
+    }
+
+    /**
+     * @dev See {IERC721-isApprovedForAll}.
+     */
+    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
+        return _operatorApprovals[owner][operator];
+    }
+
+    /**
+     * @dev See {IERC721-transferFrom}.
+     */
+    function transferFrom(address from, address to, uint256 tokenId) public virtual override {
+        //solhint-disable-next-line max-line-length
+        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner or approved");
+
+        _transfer(from, to, tokenId);
+    }
+
+    /**
+     * @dev See {IERC721-safeTransferFrom}.
+     */
+    function safeTransferFrom(address from, address to, uint256 tokenId) public virtual override {
+        safeTransferFrom(from, to, tokenId, "");
+    }
+
+    /**
+     * @dev See {IERC721-safeTransferFrom}.
+     */
+    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory data) public virtual override {
+        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner or approved");
+        _safeTransfer(from, to, tokenId, data);
+    }
+
+    /**
+     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
+     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
+     *
+     * `data` is additional data, it has no specified format and it is sent in call to `to`.
+     *
+     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
+     * implement alternative mechanisms to perform token transfer, such as signature-based.
+     *
+     * Requirements:
+     *
+     * - `from` cannot be the zero address.
+     * - `to` cannot be the zero address.
+     * - `tokenId` token must exist and be owned by `from`.
+     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
+     *
+     * Emits a {Transfer} event.
+     */
+    function _safeTransfer(address from, address to, uint256 tokenId, bytes memory data) internal virtual {
+        _transfer(from, to, tokenId);
+        require(_checkOnERC721Received(from, to, tokenId, data), "ERC721: transfer to non ERC721Receiver implementer");
+    }
+
+    /**
+     * @dev Returns the owner of the `tokenId`. Does NOT revert if token doesn't exist
+     */
+    function _ownerOf(uint256 tokenId) internal view virtual returns (address) {
+        return _owners[tokenId];
+    }
+
+    /**
+     * @dev Returns whether `tokenId` exists.
+     *
+     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
+     *
+     * Tokens start existing when they are minted (`_mint`),
+     * and stop existing when they are burned (`_burn`).
+     */
+    function _exists(uint256 tokenId) internal view virtual returns (bool) {
+        return _ownerOf(tokenId) != address(0);
+    }
+
+    /**
+     * @dev Returns whether `spender` is allowed to manage `tokenId`.
+     *
+     * Requirements:
+     *
+     * - `tokenId` must exist.
+     */
+    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
+        address owner = ERC721.ownerOf(tokenId);
+        return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == spender);
+    }
+
+    /**
+     * @dev Safely mints `tokenId` and transfers it to `to`.
+     *
+     * Requirements:
+     *
+     * - `tokenId` must not exist.
+     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
+     *
+     * Emits a {Transfer} event.
+     */
+    function _safeMint(address to, uint256 tokenId) internal virtual {
+        _safeMint(to, tokenId, "");
+    }
+
+    /**
+     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
+     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
+     */
+    function _safeMint(address to, uint256 tokenId, bytes memory data) internal virtual {
+        _mint(to, tokenId);
+        require(
+            _checkOnERC721Received(address(0), to, tokenId, data),
+            "ERC721: transfer to non ERC721Receiver implementer"
+        );
+    }
+
+    /**
+     * @dev Mints `tokenId` and transfers it to `to`.
+     *
+     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
+     *
+     * Requirements:
+     *
+     * - `tokenId` must not exist.
+     * - `to` cannot be the zero address.
+     *
+     * Emits a {Transfer} event.
+     */
+    function _mint(address to, uint256 tokenId) internal virtual {
+        require(to != address(0), "ERC721: mint to the zero address");
+        require(!_exists(tokenId), "ERC721: token already minted");
+
+        _beforeTokenTransfer(address(0), to, tokenId, 1);
+
+        // Check that tokenId was not minted by `_beforeTokenTransfer` hook
+        require(!_exists(tokenId), "ERC721: token already minted");
+
+        unchecked {
+            // Will not overflow unless all 2**256 token ids are minted to the same owner.
+            // Given that tokens are minted one by one, it is impossible in practice that
+            // this ever happens. Might change if we allow batch minting.
+            // The ERC fails to describe this case.
+            _balances[to] += 1;
+        }
+
+        _owners[tokenId] = to;
+
+        emit Transfer(address(0), to, tokenId);
+
+        _afterTokenTransfer(address(0), to, tokenId, 1);
+    }
+
+    /**
+     * @dev Destroys `tokenId`.
+     * The approval is cleared when the token is burned.
+     * This is an internal function that does not check if the sender is authorized to operate on the token.
+     *
+     * Requirements:
+     *
+     * - `tokenId` must exist.
+     *
+     * Emits a {Transfer} event.
+     */
+    function _burn(uint256 tokenId) internal virtual {
+        address owner = ERC721.ownerOf(tokenId);
+
+        _beforeTokenTransfer(owner, address(0), tokenId, 1);
+
+        // Update ownership in case tokenId was transferred by `_beforeTokenTransfer` hook
+        owner = ERC721.ownerOf(tokenId);
+
+        // Clear approvals
+        delete _tokenApprovals[tokenId];
+
+        unchecked {
+            // Cannot overflow, as that would require more tokens to be burned/transferred
+            // out than the owner initially received through minting and transferring in.
+            _balances[owner] -= 1;
+        }
+        delete _owners[tokenId];
+
+        emit Transfer(owner, address(0), tokenId);
+
+        _afterTokenTransfer(owner, address(0), tokenId, 1);
+    }
+
+    /**
+     * @dev Transfers `tokenId` from `from` to `to`.
+     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
+     *
+     * Requirements:
+     *
+     * - `to` cannot be the zero address.
+     * - `tokenId` token must be owned by `from`.
+     *
+     * Emits a {Transfer} event.
+     */
+    function _transfer(address from, address to, uint256 tokenId) internal virtual {
+        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner");
+        require(to != address(0), "ERC721: transfer to the zero address");
+
+        _beforeTokenTransfer(from, to, tokenId, 1);
+
+        // Check that tokenId was not transferred by `_beforeTokenTransfer` hook
+        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner");
+
+        // Clear approvals from the previous owner
+        delete _tokenApprovals[tokenId];
+
+        unchecked {
+            // `_balances[from]` cannot overflow for the same reason as described in `_burn`:
+            // `from`'s balance is the number of token held, which is at least one before the current
+            // transfer.
+            // `_balances[to]` could overflow in the conditions described in `_mint`. That would require
+            // all 2**256 token ids to be minted, which in practice is impossible.
+            _balances[from] -= 1;
+            _balances[to] += 1;
+        }
+        _owners[tokenId] = to;
+
+        emit Transfer(from, to, tokenId);
+
+        _afterTokenTransfer(from, to, tokenId, 1);
+    }
+
+    /**
+     * @dev Approve `to` to operate on `tokenId`
+     *
+     * Emits an {Approval} event.
+     */
+    function _approve(address to, uint256 tokenId) internal virtual {
+        _tokenApprovals[tokenId] = to;
+        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
+    }
+
+    /**
+     * @dev Approve `operator` to operate on all of `owner` tokens
+     *
+     * Emits an {ApprovalForAll} event.
+     */
+    function _setApprovalForAll(address owner, address operator, bool approved) internal virtual {
+        require(owner != operator, "ERC721: approve to caller");
+        _operatorApprovals[owner][operator] = approved;
+        emit ApprovalForAll(owner, operator, approved);
+    }
+
+    /**
+     * @dev Reverts if the `tokenId` has not been minted yet.
+     */
+    function _requireMinted(uint256 tokenId) internal view virtual {
+        require(_exists(tokenId), "ERC721: invalid token ID");
+    }
+
+    /**
+     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
+     * The call is not executed if the target address is not a contract.
+     *
+     * @param from address representing the previous owner of the given token ID
+     * @param to target address that will receive the tokens
+     * @param tokenId uint256 ID of the token to be transferred
+     * @param data bytes optional data to send along with the call
+     * @return bool whether the call correctly returned the expected magic value
+     */
+    function _checkOnERC721Received(
+        address from,
+        address to,
+        uint256 tokenId,
+        bytes memory data
+    ) private returns (bool) {
+        if (to.isContract()) {
+            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, data) returns (bytes4 retval) {
+                return retval == IERC721Receiver.onERC721Received.selector;
+            } catch (bytes memory reason) {
+                if (reason.length == 0) {
+                    revert("ERC721: transfer to non ERC721Receiver implementer");
+                } else {
+                    /// @solidity memory-safe-assembly
+                    assembly {
+                        revert(add(32, reason), mload(reason))
+                    }
+                }
+            }
+        } else {
+            return true;
+        }
+    }
+
+    /**
+     * @dev Hook that is called before any token transfer. This includes minting and burning. If {ERC721Consecutive} is
+     * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.
+     *
+     * Calling conditions:
+     *
+     * - When `from` and `to` are both non-zero, ``from``'s tokens will be transferred to `to`.
+     * - When `from` is zero, the tokens will be minted for `to`.
+     * - When `to` is zero, ``from``'s tokens will be burned.
+     * - `from` and `to` are never both zero.
+     * - `batchSize` is non-zero.
+     *
+     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
+     */
+    function _beforeTokenTransfer(address from, address to, uint256 firstTokenId, uint256 batchSize) internal virtual {}
+
+    /**
+     * @dev Hook that is called after any token transfer. This includes minting and burning. If {ERC721Consecutive} is
+     * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.
+     *
+     * Calling conditions:
+     *
+     * - When `from` and `to` are both non-zero, ``from``'s tokens were transferred to `to`.
+     * - When `from` is zero, the tokens were minted for `to`.
+     * - When `to` is zero, ``from``'s tokens were burned.
+     * - `from` and `to` are never both zero.
+     * - `batchSize` is non-zero.
+     *
+     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
+     */
+    function _afterTokenTransfer(address from, address to, uint256 firstTokenId, uint256 batchSize) internal virtual {}
+
+    /**
+     * @dev Unsafe write access to the balances, used by extensions that "mint" tokens using an {ownerOf} override.
+     *
+     * WARNING: Anyone calling this MUST ensure that the balances remain consistent with the ownership. The invariant
+     * being that for any address `a` the value returned by `balanceOf(a)` must be equal to the number of tokens such
+     * that `ownerOf(tokenId)` is `a`.
+     */
+    // solhint-disable-next-line func-name-mixedcase
+    function __unsafe_increaseBalance(address account, uint256 amount) internal {
+        _balances[account] += amount;
+    }
+}

third_party/real_code/rc16/sources/lib/tokenbound/lib/openzeppelin-contracts/contracts/token/ERC721/IERC721.sol

@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC721/IERC721.sol)
+
+pragma solidity ^0.8.0;
+
+import "../../utils/introspection/IERC165.sol";
+
+/**
+ * @dev Required interface of an ERC721 compliant contract.
+ */
+interface IERC721 is IERC165 {
+    /**
+     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
+     */
+    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
+
+    /**
+     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
+     */
+    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
+
+    /**
+     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
+     */
+    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
+
+    /**
+     * @dev Returns the number of tokens in ``owner``'s account.
+     */
+    function balanceOf(address owner) external view returns (uint256 balance);
+
+    /**
+     * @dev Returns the owner of the `tokenId` token.
+     *
+     * Requirements:
+     *
+     * - `tokenId` must exist.
+     */
+    function ownerOf(uint256 tokenId) external view returns (address owner);
+
+    /**
+     * @dev Safely transfers `tokenId` token from `from` to `to`.
+     *
+     * Requirements:
+     *
+     * - `from` cannot be the zero address.
+     * - `to` cannot be the zero address.
+     * - `tokenId` token must exist and be owned by `from`.
+     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
+     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
+     *
+     * Emits a {Transfer} event.
+     */
+    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;
+
+    /**
+     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
+     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
+     *
+     * Requirements:
+     *
+     * - `from` cannot be the zero address.
+     * - `to` cannot be the zero address.
+     * - `tokenId` token must exist and be owned by `from`.
+     * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}.
+     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
+     *
+     * Emits a {Transfer} event.
+     */
+    function safeTransferFrom(address from, address to, uint256 tokenId) external;
+
+    /**
+     * @dev Transfers `tokenId` token from `from` to `to`.
+     *
+     * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
+     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
+     * understand this adds an external call which potentially creates a reentrancy vulnerability.
+     *
+     * Requirements:
+     *
+     * - `from` cannot be the zero address.
+     * - `to` cannot be the zero address.
+     * - `tokenId` token must be owned by `from`.
+     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
+     *
+     * Emits a {Transfer} event.
+     */
+    function transferFrom(address from, address to, uint256 tokenId) external;
+
+    /**
+     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
+     * The approval is cleared when the token is transferred.
+     *
+     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
+     *
+     * Requirements:
+     *
+     * - The caller must own the token or be an approved operator.
+     * - `tokenId` must exist.
+     *
+     * Emits an {Approval} event.
+     */
+    function approve(address to, uint256 tokenId) external;
+
+    /**
+     * @dev Approve or remove `operator` as an operator for the caller.
+     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
+     *
+     * Requirements:
+     *
+     * - The `operator` cannot be the caller.
+     *
+     * Emits an {ApprovalForAll} event.
+     */
+    function setApprovalForAll(address operator, bool approved) external;
+
+    /**
+     * @dev Returns the account approved for `tokenId` token.
+     *
+     * Requirements:
+     *
+     * - `tokenId` must exist.
+     */
+    function getApproved(uint256 tokenId) external view returns (address operator);
+
+    /**
+     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
+     *
+     * See {setApprovalForAll}
+     */
+    function isApprovedForAll(address owner, address operator) external view returns (bool);
+}

third_party/real_code/rc16/sources/lib/tokenbound/lib/openzeppelin-contracts/contracts/token/ERC721/IERC721Receiver.sol

@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)
+
+pragma solidity ^0.8.0;
+
+/**
+ * @title ERC721 token receiver interface
+ * @dev Interface for any contract that wants to support safeTransfers
+ * from ERC721 asset contracts.
+ */
+interface IERC721Receiver {
+    /**
+     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
+     * by `operator` from `from`, this function is called.
+     *
+     * It must return its Solidity selector to confirm the token transfer.
+     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
+     *
+     * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.
+     */
+    function onERC721Received(
+        address operator,
+        address from,
+        uint256 tokenId,
+        bytes calldata data
+    ) external returns (bytes4);
+}

third_party/real_code/rc16/sources/lib/tokenbound/lib/openzeppelin-contracts/contracts/token/ERC721/extensions/IERC721Metadata.sol

@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)
+
+pragma solidity ^0.8.0;
+
+import "../IERC721.sol";
+
+/**
+ * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
+ * @dev See https://eips.ethereum.org/EIPS/eip-721
+ */
+interface IERC721Metadata is IERC721 {
+    /**
+     * @dev Returns the token collection name.
+     */
+    function name() external view returns (string memory);
+
+    /**
+     * @dev Returns the token collection symbol.
+     */
+    function symbol() external view returns (string memory);
+
+    /**
+     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
+     */
+    function tokenURI(uint256 tokenId) external view returns (string memory);
+}

third_party/real_code/rc16/sources/lib/tokenbound/lib/openzeppelin-contracts/contracts/utils/Address.sol

@@ -0,0 +1,244 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)
+
+pragma solidity ^0.8.1;
+
+/**
+ * @dev Collection of functions related to the address type
+ */
+library Address {
+    /**
+     * @dev Returns true if `account` is a contract.
+     *
+     * [IMPORTANT]
+     * ====
+     * It is unsafe to assume that an address for which this function returns
+     * false is an externally-owned account (EOA) and not a contract.
+     *
+     * Among others, `isContract` will return false for the following
+     * types of addresses:
+     *
+     *  - an externally-owned account
+     *  - a contract in construction
+     *  - an address where a contract will be created
+     *  - an address where a contract lived, but was destroyed
+     *
+     * Furthermore, `isContract` will also return true if the target contract within
+     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
+     * which only has an effect at the end of a transaction.
+     * ====
+     *
+     * [IMPORTANT]
+     * ====
+     * You shouldn't rely on `isContract` to protect against flash loan attacks!
+     *
+     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
+     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
+     * constructor.
+     * ====
+     */
+    function isContract(address account) internal view returns (bool) {
+        // This method relies on extcodesize/address.code.length, which returns 0
+        // for contracts in construction, since the code is only stored at the end
+        // of the constructor execution.
+
+        return account.code.length > 0;
+    }
+
+    /**
+     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
+     * `recipient`, forwarding all available gas and reverting on errors.
+     *
+     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
+     * of certain opcodes, possibly making contracts go over the 2300 gas limit
+     * imposed by `transfer`, making them unable to receive funds via
+     * `transfer`. {sendValue} removes this limitation.
+     *
+     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
+     *
+     * IMPORTANT: because control is transferred to `recipient`, care must be
+     * taken to not create reentrancy vulnerabilities. Consider using
+     * {ReentrancyGuard} or the
+     * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
+     */
+    function sendValue(address payable recipient, uint256 amount) internal {
+        require(address(this).balance >= amount, "Address: insufficient balance");
+
+        (bool success, ) = recipient.call{value: amount}("");
+        require(success, "Address: unable to send value, recipient may have reverted");
+    }
+
+    /**
+     * @dev Performs a Solidity function call using a low level `call`. A
+     * plain `call` is an unsafe replacement for a function call: use this
+     * function instead.
+     *
+     * If `target` reverts with a revert reason, it is bubbled up by this
+     * function (like regular Solidity function calls).
+     *
+     * Returns the raw returned data. To convert to the expected return value,
+     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
+     *
+     * Requirements:
+     *
+     * - `target` must be a contract.
+     * - calling `target` with `data` must not revert.
+     *
+     * _Available since v3.1._
+     */
+    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
+        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
+    }
+
+    /**
+     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
+     * `errorMessage` as a fallback revert reason when `target` reverts.
+     *
+     * _Available since v3.1._
+     */
+    function functionCall(
+        address target,
+        bytes memory data,
+        string memory errorMessage
+    ) internal returns (bytes memory) {
+        return functionCallWithValue(target, data, 0, errorMessage);
+    }
+
+    /**
+     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
+     * but also transferring `value` wei to `target`.
+     *
+     * Requirements:
+     *
+     * - the calling contract must have an ETH balance of at least `value`.
+     * - the called Solidity function must be `payable`.
+     *
+     * _Available since v3.1._
+     */
+    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
+        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
+    }
+
+    /**
+     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
+     * with `errorMessage` as a fallback revert reason when `target` reverts.
+     *
+     * _Available since v3.1._
+     */
+    function functionCallWithValue(
+        address target,
+        bytes memory data,
+        uint256 value,
+        string memory errorMessage
+    ) internal returns (bytes memory) {
+        require(address(this).balance >= value, "Address: insufficient balance for call");
+        (bool success, bytes memory returndata) = target.call{value: value}(data);
+        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
+    }
+
+    /**
+     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
+     * but performing a static call.
+     *
+     * _Available since v3.3._
+     */
+    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
+        return functionStaticCall(target, data, "Address: low-level static call failed");
+    }
+
+    /**
+     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
+     * but performing a static call.
+     *
+     * _Available since v3.3._
+     */
+    function functionStaticCall(
+        address target,
+        bytes memory data,
+        string memory errorMessage
+    ) internal view returns (bytes memory) {
+        (bool success, bytes memory returndata) = target.staticcall(data);
+        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
+    }
+
+    /**
+     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
+     * but performing a delegate call.
+     *
+     * _Available since v3.4._
+     */
+    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
+        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
+    }
+
+    /**
+     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
+     * but performing a delegate call.
+     *
+     * _Available since v3.4._
+     */
+    function functionDelegateCall(
+        address target,
+        bytes memory data,
+        string memory errorMessage
+    ) internal returns (bytes memory) {
+        (bool success, bytes memory returndata) = target.delegatecall(data);
+        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
+    }
+
+    /**
+     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
+     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
+     *
+     * _Available since v4.8._
+     */
+    function verifyCallResultFromTarget(
+        address target,
+        bool success,
+        bytes memory returndata,
+        string memory errorMessage
+    ) internal view returns (bytes memory) {
+        if (success) {
+            if (returndata.length == 0) {
+                // only check isContract if the call was successful and the return data is empty
+                // otherwise we already know that it was a contract
+                require(isContract(target), "Address: call to non-contract");
+            }
+            return returndata;
+        } else {
+            _revert(returndata, errorMessage);
+        }
+    }
+
+    /**
+     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
+     * revert reason or using the provided one.
+     *
+     * _Available since v4.3._
+     */
+    function verifyCallResult(
+        bool success,
+        bytes memory returndata,
+        string memory errorMessage
+    ) internal pure returns (bytes memory) {
+        if (success) {
+            return returndata;
+        } else {
+            _revert(returndata, errorMessage);
+        }
+    }
+
+    function _revert(bytes memory returndata, string memory errorMessage) private pure {
+        // Look for revert reason and bubble it up if present
+        if (returndata.length > 0) {
+            // The easiest way to bubble the revert reason is using memory via assembly
+            /// @solidity memory-safe-assembly
+            assembly {
+                let returndata_size := mload(returndata)
+                revert(add(32, returndata), returndata_size)
+            }
+        } else {
+            revert(errorMessage);
+        }
+    }
+}

third_party/real_code/rc16/sources/lib/tokenbound/lib/openzeppelin-contracts/contracts/utils/Context.sol

@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
+
+pragma solidity ^0.8.0;
+
+/**
+ * @dev Provides information about the current execution context, including the
+ * sender of the transaction and its data. While these are generally available
+ * via msg.sender and msg.data, they should not be accessed in such a direct
+ * manner, since when dealing with meta-transactions the account sending and
+ * paying for execution may not be the actual sender (as far as an application
+ * is concerned).
+ *
+ * This contract is only required for intermediate, library-like contracts.
+ */
+abstract contract Context {
+    function _msgSender() internal view virtual returns (address) {
+        return msg.sender;
+    }
+
+    function _msgData() internal view virtual returns (bytes calldata) {
+        return msg.data;
+    }
+}

third_party/real_code/rc16/sources/lib/tokenbound/lib/openzeppelin-contracts/contracts/utils/Strings.sol

@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v4.9.0) (utils/Strings.sol)
+
+pragma solidity ^0.8.0;
+
+import "./math/Math.sol";
+import "./math/SignedMath.sol";
+
+/**
+ * @dev String operations.
+ */
+library Strings {
+    bytes16 private constant _SYMBOLS = "0123456789abcdef";
+    uint8 private constant _ADDRESS_LENGTH = 20;
+
+    /**
+     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
+     */
+    function toString(uint256 value) internal pure returns (string memory) {
+        unchecked {
+            uint256 length = Math.log10(value) + 1;
+            string memory buffer = new string(length);
+            uint256 ptr;
+            /// @solidity memory-safe-assembly
+            assembly {
+                ptr := add(buffer, add(32, length))
+            }
+            while (true) {
+                ptr--;
+                /// @solidity memory-safe-assembly
+                assembly {
+                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
+                }
+                value /= 10;
+                if (value == 0) break;
+            }
+            return buffer;
+        }
+    }
+
+    /**
+     * @dev Converts a `int256` to its ASCII `string` decimal representation.
+     */
+    function toString(int256 value) internal pure returns (string memory) {
+        return string(abi.encodePacked(value < 0 ? "-" : "", toString(SignedMath.abs(value))));
+    }
+
+    /**
+     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
+     */
+    function toHexString(uint256 value) internal pure returns (string memory) {
+        unchecked {
+            return toHexString(value, Math.log256(value) + 1);
+        }
+    }
+
+    /**
+     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
+     */
+    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
+        bytes memory buffer = new bytes(2 * length + 2);
+        buffer[0] = "0";
+        buffer[1] = "x";
+        for (uint256 i = 2 * length + 1; i > 1; --i) {
+            buffer[i] = _SYMBOLS[value & 0xf];
+            value >>= 4;
+        }
+        require(value == 0, "Strings: hex length insufficient");
+        return string(buffer);
+    }
+
+    /**
+     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
+     */
+    function toHexString(address addr) internal pure returns (string memory) {
+        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
+    }
+
+    /**
+     * @dev Returns true if the two strings are equal.
+     */
+    function equal(string memory a, string memory b) internal pure returns (bool) {
+        return keccak256(bytes(a)) == keccak256(bytes(b));
+    }
+}

third_party/real_code/rc16/sources/lib/tokenbound/lib/openzeppelin-contracts/contracts/utils/introspection/ERC165.sol

@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)
+
+pragma solidity ^0.8.0;
+
+import "./IERC165.sol";
+
+/**
+ * @dev Implementation of the {IERC165} interface.
+ *
+ * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
+ * for the additional interface id that will be supported. For example:
+ *
+ * ```solidity
+ * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
+ *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
+ * }
+ * ```
+ *
+ * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
+ */
+abstract contract ERC165 is IERC165 {
+    /**
+     * @dev See {IERC165-supportsInterface}.
+     */
+    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
+        return interfaceId == type(IERC165).interfaceId;
+    }
+}

third_party/real_code/rc16/sources/lib/tokenbound/lib/openzeppelin-contracts/contracts/utils/introspection/IERC165.sol

@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)
+
+pragma solidity ^0.8.0;
+
+/**
+ * @dev Interface of the ERC165 standard, as defined in the
+ * https://eips.ethereum.org/EIPS/eip-165[EIP].
+ *
+ * Implementers can declare support of contract interfaces, which can then be
+ * queried by others ({ERC165Checker}).
+ *
+ * For an implementation, see {ERC165}.
+ */
+interface IERC165 {
+    /**
+     * @dev Returns true if this contract implements the interface defined by
+     * `interfaceId`. See the corresponding
+     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
+     * to learn more about how these ids are created.
+     *
+     * This function call must use less than 30 000 gas.
+     */
+    function supportsInterface(bytes4 interfaceId) external view returns (bool);
+}

third_party/real_code/rc16/sources/lib/tokenbound/lib/openzeppelin-contracts/contracts/utils/math/Math.sol

@@ -0,0 +1,339 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol)
+
+pragma solidity ^0.8.0;
+
+/**
+ * @dev Standard math utilities missing in the Solidity language.
+ */
+library Math {
+    enum Rounding {
+        Down, // Toward negative infinity
+        Up, // Toward infinity
+        Zero // Toward zero
+    }
+
+    /**
+     * @dev Returns the largest of two numbers.
+     */
+    function max(uint256 a, uint256 b) internal pure returns (uint256) {
+        return a > b ? a : b;
+    }
+
+    /**
+     * @dev Returns the smallest of two numbers.
+     */
+    function min(uint256 a, uint256 b) internal pure returns (uint256) {
+        return a < b ? a : b;
+    }
+
+    /**
+     * @dev Returns the average of two numbers. The result is rounded towards
+     * zero.
+     */
+    function average(uint256 a, uint256 b) internal pure returns (uint256) {
+        // (a + b) / 2 can overflow.
+        return (a & b) + (a ^ b) / 2;
+    }
+
+    /**
+     * @dev Returns the ceiling of the division of two numbers.
+     *
+     * This differs from standard division with `/` in that it rounds up instead
+     * of rounding down.
+     */
+    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
+        // (a + b - 1) / b can overflow on addition, so we distribute.
+        return a == 0 ? 0 : (a - 1) / b + 1;
+    }
+
+    /**
+     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
+     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
+     * with further edits by Uniswap Labs also under MIT license.
+     */
+    function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
+        unchecked {
+            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
+            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
+            // variables such that product = prod1 * 2^256 + prod0.
+            uint256 prod0; // Least significant 256 bits of the product
+            uint256 prod1; // Most significant 256 bits of the product
+            assembly {
+                let mm := mulmod(x, y, not(0))
+                prod0 := mul(x, y)
+                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
+            }
+
+            // Handle non-overflow cases, 256 by 256 division.
+            if (prod1 == 0) {
+                // Solidity will revert if denominator == 0, unlike the div opcode on its own.
+                // The surrounding unchecked block does not change this fact.
+                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
+                return prod0 / denominator;
+            }
+
+            // Make sure the result is less than 2^256. Also prevents denominator == 0.
+            require(denominator > prod1, "Math: mulDiv overflow");
+
+            ///////////////////////////////////////////////
+            // 512 by 256 division.
+            ///////////////////////////////////////////////
+
+            // Make division exact by subtracting the remainder from [prod1 prod0].
+            uint256 remainder;
+            assembly {
+                // Compute remainder using mulmod.
+                remainder := mulmod(x, y, denominator)
+
+                // Subtract 256 bit number from 512 bit number.
+                prod1 := sub(prod1, gt(remainder, prod0))
+                prod0 := sub(prod0, remainder)
+            }
+
+            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
+            // See https://cs.stackexchange.com/q/138556/92363.
+
+            // Does not overflow because the denominator cannot be zero at this stage in the function.
+            uint256 twos = denominator & (~denominator + 1);
+            assembly {
+                // Divide denominator by twos.
+                denominator := div(denominator, twos)
+
+                // Divide [prod1 prod0] by twos.
+                prod0 := div(prod0, twos)
+
+                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
+                twos := add(div(sub(0, twos), twos), 1)
+            }
+
+            // Shift in bits from prod1 into prod0.
+            prod0 |= prod1 * twos;
+
+            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
+            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
+            // four bits. That is, denominator * inv = 1 mod 2^4.
+            uint256 inverse = (3 * denominator) ^ 2;
+
+            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
+            // in modular arithmetic, doubling the correct bits in each step.
+            inverse *= 2 - denominator * inverse; // inverse mod 2^8
+            inverse *= 2 - denominator * inverse; // inverse mod 2^16
+            inverse *= 2 - denominator * inverse; // inverse mod 2^32
+            inverse *= 2 - denominator * inverse; // inverse mod 2^64
+            inverse *= 2 - denominator * inverse; // inverse mod 2^128
+            inverse *= 2 - denominator * inverse; // inverse mod 2^256
+
+            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
+            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
+            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
+            // is no longer required.
+            result = prod0 * inverse;
+            return result;
+        }
+    }
+
+    /**
+     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
+     */
+    function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
+        uint256 result = mulDiv(x, y, denominator);
+        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
+            result += 1;
+        }
+        return result;
+    }
+
+    /**
+     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
+     *
+     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
+     */
+    function sqrt(uint256 a) internal pure returns (uint256) {
+        if (a == 0) {
+            return 0;
+        }
+
+        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
+        //
+        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
+        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
+        //
+        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
+        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
+        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
+        //
+        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
+        uint256 result = 1 << (log2(a) >> 1);
+
+        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
+        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
+        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
+        // into the expected uint128 result.
+        unchecked {
+            result = (result + a / result) >> 1;
+            result = (result + a / result) >> 1;
+            result = (result + a / result) >> 1;
+            result = (result + a / result) >> 1;
+            result = (result + a / result) >> 1;
+            result = (result + a / result) >> 1;
+            result = (result + a / result) >> 1;
+            return min(result, a / result);
+        }
+    }
+
+    /**
+     * @notice Calculates sqrt(a), following the selected rounding direction.
+     */
+    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
+        unchecked {
+            uint256 result = sqrt(a);
+            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
+        }
+    }
+
+    /**
+     * @dev Return the log in base 2, rounded down, of a positive value.
+     * Returns 0 if given 0.
+     */
+    function log2(uint256 value) internal pure returns (uint256) {
+        uint256 result = 0;
+        unchecked {
+            if (value >> 128 > 0) {
+                value >>= 128;
+                result += 128;
+            }
+            if (value >> 64 > 0) {
+                value >>= 64;
+                result += 64;
+            }
+            if (value >> 32 > 0) {
+                value >>= 32;
+                result += 32;
+            }
+            if (value >> 16 > 0) {
+                value >>= 16;
+                result += 16;
+            }
+            if (value >> 8 > 0) {
+                value >>= 8;
+                result += 8;
+            }
+            if (value >> 4 > 0) {
+                value >>= 4;
+                result += 4;
+            }
+            if (value >> 2 > 0) {
+                value >>= 2;
+                result += 2;
+            }
+            if (value >> 1 > 0) {
+                result += 1;
+            }
+        }
+        return result;
+    }
+
+    /**
+     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
+     * Returns 0 if given 0.
+     */
+    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
+        unchecked {
+            uint256 result = log2(value);
+            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
+        }
+    }
+
+    /**
+     * @dev Return the log in base 10, rounded down, of a positive value.
+     * Returns 0 if given 0.
+     */
+    function log10(uint256 value) internal pure returns (uint256) {
+        uint256 result = 0;
+        unchecked {
+            if (value >= 10 ** 64) {
+                value /= 10 ** 64;
+                result += 64;
+            }
+            if (value >= 10 ** 32) {
+                value /= 10 ** 32;
+                result += 32;
+            }
+            if (value >= 10 ** 16) {
+                value /= 10 ** 16;
+                result += 16;
+            }
+            if (value >= 10 ** 8) {
+                value /= 10 ** 8;
+                result += 8;
+            }
+            if (value >= 10 ** 4) {
+                value /= 10 ** 4;
+                result += 4;
+            }
+            if (value >= 10 ** 2) {
+                value /= 10 ** 2;
+                result += 2;
+            }
+            if (value >= 10 ** 1) {
+                result += 1;
+            }
+        }
+        return result;
+    }
+
+    /**
+     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
+     * Returns 0 if given 0.
+     */
+    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
+        unchecked {
+            uint256 result = log10(value);
+            return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
+        }
+    }
+
+    /**
+     * @dev Return the log in base 256, rounded down, of a positive value.
+     * Returns 0 if given 0.
+     *
+     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
+     */
+    function log256(uint256 value) internal pure returns (uint256) {
+        uint256 result = 0;
+        unchecked {
+            if (value >> 128 > 0) {
+                value >>= 128;
+                result += 16;
+            }
+            if (value >> 64 > 0) {
+                value >>= 64;
+                result += 8;
+            }
+            if (value >> 32 > 0) {
+                value >>= 32;
+                result += 4;
+            }
+            if (value >> 16 > 0) {
+                value >>= 16;
+                result += 2;
+            }
+            if (value >> 8 > 0) {
+                result += 1;
+            }
+        }
+        return result;
+    }
+
+    /**
+     * @dev Return the log in base 256, following the selected rounding direction, of a positive value.
+     * Returns 0 if given 0.
+     */
+    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
+        unchecked {
+            uint256 result = log256(value);
+            return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
+        }
+    }
+}

third_party/real_code/rc16/sources/lib/tokenbound/lib/openzeppelin-contracts/contracts/utils/math/SignedMath.sol

@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/SignedMath.sol)
+
+pragma solidity ^0.8.0;
+
+/**
+ * @dev Standard signed math utilities missing in the Solidity language.
+ */
+library SignedMath {
+    /**
+     * @dev Returns the largest of two signed numbers.
+     */
+    function max(int256 a, int256 b) internal pure returns (int256) {
+        return a > b ? a : b;
+    }
+
+    /**
+     * @dev Returns the smallest of two signed numbers.
+     */
+    function min(int256 a, int256 b) internal pure returns (int256) {
+        return a < b ? a : b;
+    }
+
+    /**
+     * @dev Returns the average of two signed numbers without overflow.
+     * The result is rounded towards zero.
+     */
+    function average(int256 a, int256 b) internal pure returns (int256) {
+        // Formula from the book "Hacker's Delight"
+        int256 x = (a & b) + ((a ^ b) >> 1);
+        return x + (int256(uint256(x) >> 255) & (a ^ b));
+    }
+
+    /**
+     * @dev Returns the absolute unsigned value of a signed value.
+     */
+    function abs(int256 n) internal pure returns (uint256) {
+        unchecked {
+            // must be unchecked in order to support `n = type(int256).min`
+            return uint256(n >= 0 ? n : -n);
+        }
+    }
+}

third_party/real_code/rc16/sources/src/MichiWalletNFT.sol

@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.13;
+
+import "@openzeppelin/contracts/access/Ownable.sol";
+import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
+
+contract MichiWalletNFT is ERC721, Ownable {
+    /// @notice tracks the next index to be minted
+    uint256 public currentIndex;
+
+    /// @notice tracks the total supply minted
+    uint256 public totalSupply;
+
+    /// @notice mint price in ETH
+    uint256 public mintPrice;
+
+    event Mint(address indexed minter, uint256 nftId);
+
+    event Withdrawal(address indexed withdrawer, uint256 amount);
+
+    error InvalidPayableAmount(uint256 amount);
+
+    error WithdrawalFailed();
+
+    constructor(uint256 startingIndex_, uint256 mintPrice_) ERC721("Michi Wallet NFT", "MICHI") {
+        currentIndex = startingIndex_;
+        mintPrice = mintPrice_;
+    }
+
+    function getCurrentIndex() public view returns (uint256) {
+        return currentIndex;
+    }
+
+    function getMintPrice() external view returns (uint256) {
+        return mintPrice;
+    }
+
+    function mint(address to) external payable {
+        if (msg.value != mintPrice) revert InvalidPayableAmount(msg.value);
+        _safeMint(to, currentIndex);
+
+        emit Mint(to, currentIndex);
+        currentIndex++;
+        totalSupply++;
+    }
+
+    function setMintPrice(uint256 newMintPrice_) external onlyOwner {
+        mintPrice = newMintPrice_;
+    }
+
+    function withdraw(address to) external onlyOwner {
+        uint256 withdrawAmount = address(this).balance;
+        (bool success,) = to.call{value: withdrawAmount}("");
+
+        if (!success) revert WithdrawalFailed();
+
+        emit Withdrawal(msg.sender, withdrawAmount);
+    }
+
+    receive() external payable {}
+}

third_party/real_code/rc17/NOTICE

@@ -0,0 +1,71 @@
+# Notice for rc17
+
+This package contains smart contract source files verified on Sourcify.
+
+## Source Files and Licensing
+
+- File: `@openzeppelin/contracts/access/Ownable.sol`
+  SPDX: MIT
+
+- File: `@openzeppelin/contracts/interfaces/IERC165.sol`
+  SPDX: MIT
+
+- File: `@openzeppelin/contracts/interfaces/IERC4906.sol`
+  SPDX: MIT
+
+- File: `@openzeppelin/contracts/interfaces/IERC721.sol`
+  SPDX: MIT
+
+- File: `@openzeppelin/contracts/interfaces/draft-IERC6093.sol`
+  SPDX: MIT
+
+- File: `@openzeppelin/contracts/token/ERC721/ERC721.sol`
+  SPDX: MIT
+
+- File: `@openzeppelin/contracts/token/ERC721/IERC721.sol`
+  SPDX: MIT
+
+- File: `@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol`
+  SPDX: MIT
+
+- File: `@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol`
+  SPDX: MIT
+
+- File: `@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol`
+  SPDX: MIT
+
+- File: `@openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol`
+  SPDX: MIT
+
+- File: `@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol`
+  SPDX: MIT
+
+- File: `@openzeppelin/contracts/token/ERC721/utils/ERC721Utils.sol`
+  SPDX: MIT
+
+- File: `@openzeppelin/contracts/utils/Context.sol`
+  SPDX: MIT
+
+- File: `@openzeppelin/contracts/utils/Panic.sol`
+  SPDX: MIT
+
+- File: `@openzeppelin/contracts/utils/Strings.sol`
+  SPDX: MIT
+
+- File: `@openzeppelin/contracts/utils/introspection/ERC165.sol`
+  SPDX: MIT
+
+- File: `@openzeppelin/contracts/utils/introspection/IERC165.sol`
+  SPDX: MIT
+
+- File: `@openzeppelin/contracts/utils/math/Math.sol`
+  SPDX: MIT
+
+- File: `@openzeppelin/contracts/utils/math/SafeCast.sol`
+  SPDX: MIT
+
+- File: `@openzeppelin/contracts/utils/math/SignedMath.sol`
+  SPDX: MIT
+
+- File: `contracts/SharpNFT.sol`
+  SPDX: MIT

third_party/real_code/rc17/abi.json

@@ -0,0 +1,666 @@
+[
+  {
+    "type": "constructor",
+    "inputs": [
+      {
+        "name": "initialOwner",
+        "type": "address",
+        "internalType": "address"
+      }
+    ],
+    "stateMutability": "nonpayable"
+  },
+  {
+    "name": "ERC721EnumerableForbiddenBatchMint",
+    "type": "error",
+    "inputs": []
+  },
+  {
+    "name": "ERC721IncorrectOwner",
+    "type": "error",
+    "inputs": [
+      {
+        "name": "sender",
+        "type": "address",
+        "internalType": "address"
+      },
+      {
+        "name": "tokenId",
+        "type": "uint256",
+        "internalType": "uint256"
+      },
+      {
+        "name": "owner",
+        "type": "address",
+        "internalType": "address"
+      }
+    ]
+  },
+  {
+    "name": "ERC721InsufficientApproval",
+    "type": "error",
+    "inputs": [
+      {
+        "name": "operator",
+        "type": "address",
+        "internalType": "address"
+      },
+      {
+        "name": "tokenId",
+        "type": "uint256",
+        "internalType": "uint256"
+      }
+    ]
+  },
+  {
+    "name": "ERC721InvalidApprover",
+    "type": "error",
+    "inputs": [
+      {
+        "name": "approver",
+        "type": "address",
+        "internalType": "address"
+      }
+    ]
+  },
+  {
+    "name": "ERC721InvalidOperator",
+    "type": "error",
+    "inputs": [
+      {
+        "name": "operator",
+        "type": "address",
+        "internalType": "address"
+      }
+    ]
+  },
+  {
+    "name": "ERC721InvalidOwner",
+    "type": "error",
+    "inputs": [
+      {
+        "name": "owner",
+        "type": "address",
+        "internalType": "address"
+      }
+    ]
+  },
+  {
+    "name": "ERC721InvalidReceiver",
+    "type": "error",
+    "inputs": [
+      {
+        "name": "receiver",
+        "type": "address",
+        "internalType": "address"
+      }
+    ]
+  },
+  {
+    "name": "ERC721InvalidSender",
+    "type": "error",
+    "inputs": [
+      {
+        "name": "sender",
+        "type": "address",
+        "internalType": "address"
+      }
+    ]
+  },
+  {
+    "name": "ERC721NonexistentToken",
+    "type": "error",
+    "inputs": [
+      {
+        "name": "tokenId",
+        "type": "uint256",
+        "internalType": "uint256"
+      }
+    ]
+  },
+  {
+    "name": "ERC721OutOfBoundsIndex",
+    "type": "error",
+    "inputs": [
+      {
+        "name": "owner",
+        "type": "address",
+        "internalType": "address"
+      },
+      {
+        "name": "index",
+        "type": "uint256",
+        "internalType": "uint256"
+      }
+    ]
+  },
+  {
+    "name": "OwnableInvalidOwner",
+    "type": "error",
+    "inputs": [
+      {
+        "name": "owner",
+        "type": "address",
+        "internalType": "address"
+      }
+    ]
+  },
+  {
+    "name": "OwnableUnauthorizedAccount",
+    "type": "error",
+    "inputs": [
+      {
+        "name": "account",
+        "type": "address",
+        "internalType": "address"
+      }
+    ]
+  },
+  {
+    "name": "Approval",
+    "type": "event",
+    "inputs": [
+      {
+        "name": "owner",
+        "type": "address",
+        "indexed": true,
+        "internalType": "address"
+      },
+      {
+        "name": "approved",
+        "type": "address",
+        "indexed": true,
+        "internalType": "address"
+      },
+      {
+        "name": "tokenId",
+        "type": "uint256",
+        "indexed": true,
+        "internalType": "uint256"
+      }
+    ],
+    "anonymous": false
+  },
+  {
+    "name": "ApprovalForAll",
+    "type": "event",
+    "inputs": [
+      {
+        "name": "owner",
+        "type": "address",
+        "indexed": true,
+        "internalType": "address"
+      },
+      {
+        "name": "operator",
+        "type": "address",
+        "indexed": true,
+        "internalType": "address"
+      },
+      {
+        "name": "approved",
+        "type": "bool",
+        "indexed": false,
+        "internalType": "bool"
+      }
+    ],
+    "anonymous": false
+  },
+  {
+    "name": "BatchMetadataUpdate",
+    "type": "event",
+    "inputs": [
+      {
+        "name": "_fromTokenId",
+        "type": "uint256",
+        "indexed": false,
+        "internalType": "uint256"
+      },
+      {
+        "name": "_toTokenId",
+        "type": "uint256",
+        "indexed": false,
+        "internalType": "uint256"
+      }
+    ],
+    "anonymous": false
+  },
+  {
+    "name": "Locked",
+    "type": "event",
+    "inputs": [
+      {
+        "name": "tokenId",
+        "type": "uint256",
+        "indexed": false,
+        "internalType": "uint256"
+      }
+    ],
+    "anonymous": false
+  },
+  {
+    "name": "MetadataUpdate",
+    "type": "event",
+    "inputs": [
+      {
+        "name": "_tokenId",
+        "type": "uint256",
+        "indexed": false,
+        "internalType": "uint256"
+      }
+    ],
+    "anonymous": false
+  },
+  {
+    "name": "OwnershipTransferred",
+    "type": "event",
+    "inputs": [
+      {
+        "name": "previousOwner",
+        "type": "address",
+        "indexed": true,
+        "internalType": "address"
+      },
+      {
+        "name": "newOwner",
+        "type": "address",
+        "indexed": true,
+        "internalType": "address"
+      }
+    ],
+    "anonymous": false
+  },
+  {
+    "name": "Transfer",
+    "type": "event",
+    "inputs": [
+      {
+        "name": "from",
+        "type": "address",
+        "indexed": true,
+        "internalType": "address"
+      },
+      {
+        "name": "to",
+        "type": "address",
+        "indexed": true,
+        "internalType": "address"
+      },
+      {
+        "name": "tokenId",
+        "type": "uint256",
+        "indexed": true,
+        "internalType": "uint256"
+      }
+    ],
+    "anonymous": false
+  },
+  {
+    "name": "approve",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "to",
+        "type": "address",
+        "internalType": "address"
+      },
+      {
+        "name": "tokenId",
+        "type": "uint256",
+        "internalType": "uint256"
+      }
+    ],
+    "outputs": [],
+    "stateMutability": "nonpayable"
+  },
+  {
+    "name": "balanceOf",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "owner",
+        "type": "address",
+        "internalType": "address"
+      }
+    ],
+    "outputs": [
+      {
+        "name": "",
+        "type": "uint256",
+        "internalType": "uint256"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "getApproved",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "tokenId",
+        "type": "uint256",
+        "internalType": "uint256"
+      }
+    ],
+    "outputs": [
+      {
+        "name": "",
+        "type": "address",
+        "internalType": "address"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "isApprovedForAll",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "owner",
+        "type": "address",
+        "internalType": "address"
+      },
+      {
+        "name": "operator",
+        "type": "address",
+        "internalType": "address"
+      }
+    ],
+    "outputs": [
+      {
+        "name": "",
+        "type": "bool",
+        "internalType": "bool"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "name",
+    "type": "function",
+    "inputs": [],
+    "outputs": [
+      {
+        "name": "",
+        "type": "string",
+        "internalType": "string"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "owner",
+    "type": "function",
+    "inputs": [],
+    "outputs": [
+      {
+        "name": "",
+        "type": "address",
+        "internalType": "address"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "ownerOf",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "tokenId",
+        "type": "uint256",
+        "internalType": "uint256"
+      }
+    ],
+    "outputs": [
+      {
+        "name": "",
+        "type": "address",
+        "internalType": "address"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "renounceOwnership",
+    "type": "function",
+    "inputs": [],
+    "outputs": [],
+    "stateMutability": "nonpayable"
+  },
+  {
+    "name": "safeMint",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "to",
+        "type": "address",
+        "internalType": "address"
+      },
+      {
+        "name": "uri",
+        "type": "string",
+        "internalType": "string"
+      }
+    ],
+    "outputs": [
+      {
+        "name": "",
+        "type": "uint256",
+        "internalType": "uint256"
+      }
+    ],
+    "stateMutability": "nonpayable"
+  },
+  {
+    "name": "safeTransferFrom",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "from",
+        "type": "address",
+        "internalType": "address"
+      },
+      {
+        "name": "to",
+        "type": "address",
+        "internalType": "address"
+      },
+      {
+        "name": "tokenId",
+        "type": "uint256",
+        "internalType": "uint256"
+      }
+    ],
+    "outputs": [],
+    "stateMutability": "nonpayable"
+  },
+  {
+    "name": "safeTransferFrom",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "from",
+        "type": "address",
+        "internalType": "address"
+      },
+      {
+        "name": "to",
+        "type": "address",
+        "internalType": "address"
+      },
+      {
+        "name": "tokenId",
+        "type": "uint256",
+        "internalType": "uint256"
+      },
+      {
+        "name": "data",
+        "type": "bytes",
+        "internalType": "bytes"
+      }
+    ],
+    "outputs": [],
+    "stateMutability": "nonpayable"
+  },
+  {
+    "name": "setApprovalForAll",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "operator",
+        "type": "address",
+        "internalType": "address"
+      },
+      {
+        "name": "approved",
+        "type": "bool",
+        "internalType": "bool"
+      }
+    ],
+    "outputs": [],
+    "stateMutability": "nonpayable"
+  },
+  {
+    "name": "supportsInterface",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "interfaceId",
+        "type": "bytes4",
+        "internalType": "bytes4"
+      }
+    ],
+    "outputs": [
+      {
+        "name": "",
+        "type": "bool",
+        "internalType": "bool"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "symbol",
+    "type": "function",
+    "inputs": [],
+    "outputs": [
+      {
+        "name": "",
+        "type": "string",
+        "internalType": "string"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "tokenByIndex",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "index",
+        "type": "uint256",
+        "internalType": "uint256"
+      }
+    ],
+    "outputs": [
+      {
+        "name": "",
+        "type": "uint256",
+        "internalType": "uint256"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "tokenOfOwnerByIndex",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "owner",
+        "type": "address",
+        "internalType": "address"
+      },
+      {
+        "name": "index",
+        "type": "uint256",
+        "internalType": "uint256"
+      }
+    ],
+    "outputs": [
+      {
+        "name": "",
+        "type": "uint256",
+        "internalType": "uint256"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "tokenURI",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "tokenId",
+        "type": "uint256",
+        "internalType": "uint256"
+      }
+    ],
+    "outputs": [
+      {
+        "name": "",
+        "type": "string",
+        "internalType": "string"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "totalSupply",
+    "type": "function",
+    "inputs": [],
+    "outputs": [
+      {
+        "name": "",
+        "type": "uint256",
+        "internalType": "uint256"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "transferFrom",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "from",
+        "type": "address",
+        "internalType": "address"
+      },
+      {
+        "name": "to",
+        "type": "address",
+        "internalType": "address"
+      },
+      {
+        "name": "tokenId",
+        "type": "uint256",
+        "internalType": "uint256"
+      }
+    ],
+    "outputs": [],
+    "stateMutability": "nonpayable"
+  },
+  {
+    "name": "transferOwnership",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "newOwner",
+        "type": "address",
+        "internalType": "address"
+      }
+    ],
+    "outputs": [],
+    "stateMutability": "nonpayable"
+  }
+]

third_party/real_code/rc17/creation.hex

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third_party/real_code/rc17/provenance.json

@@ -0,0 +1,10 @@
+{
+  "id": "rc17",
+  "chain": "base",
+  "address": "0x85ea801b2e74b99f743dc870dd07199003d47145",
+  "is_proxy": false,
+  "implementation": "",
+  "sourcify_match_type": "exact_match",
+  "fetched_utc_time": "2026-07-09T15:15:42Z",
+  "creation_hex_sha256": "9cf1039212a1425c79dc6a5edf88b8dffe0e87aceddc1172aa9f2b136b7a5b6e"
+}

third_party/real_code/rc17/recipe.yaml

@@ -0,0 +1,11 @@
+steps:
+- signer: deployer
+  deploy: $target
+  args:
+  - '0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266'
+- signer: deployer
+  to: $target
+  function: safeMint
+  args:
+  - $alice
+  - uri

third_party/real_code/rc17/sources/@openzeppelin/contracts/access/Ownable.sol

@@ -0,0 +1,100 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)
+
+pragma solidity ^0.8.20;
+
+import {Context} from "../utils/Context.sol";
+
+/**
+ * @dev Contract module which provides a basic access control mechanism, where
+ * there is an account (an owner) that can be granted exclusive access to
+ * specific functions.
+ *
+ * The initial owner is set to the address provided by the deployer. This can
+ * later be changed with {transferOwnership}.
+ *
+ * This module is used through inheritance. It will make available the modifier
+ * `onlyOwner`, which can be applied to your functions to restrict their use to
+ * the owner.
+ */
+abstract contract Ownable is Context {
+    address private _owner;
+
+    /**
+     * @dev The caller account is not authorized to perform an operation.
+     */
+    error OwnableUnauthorizedAccount(address account);
+
+    /**
+     * @dev The owner is not a valid owner account. (eg. `address(0)`)
+     */
+    error OwnableInvalidOwner(address owner);
+
+    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
+
+    /**
+     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
+     */
+    constructor(address initialOwner) {
+        if (initialOwner == address(0)) {
+            revert OwnableInvalidOwner(address(0));
+        }
+        _transferOwnership(initialOwner);
+    }
+
+    /**
+     * @dev Throws if called by any account other than the owner.
+     */
+    modifier onlyOwner() {
+        _checkOwner();
+        _;
+    }
+
+    /**
+     * @dev Returns the address of the current owner.
+     */
+    function owner() public view virtual returns (address) {
+        return _owner;
+    }
+
+    /**
+     * @dev Throws if the sender is not the owner.
+     */
+    function _checkOwner() internal view virtual {
+        if (owner() != _msgSender()) {
+            revert OwnableUnauthorizedAccount(_msgSender());
+        }
+    }
+
+    /**
+     * @dev Leaves the contract without owner. It will not be possible to call
+     * `onlyOwner` functions. Can only be called by the current owner.
+     *
+     * NOTE: Renouncing ownership will leave the contract without an owner,
+     * thereby disabling any functionality that is only available to the owner.
+     */
+    function renounceOwnership() public virtual onlyOwner {
+        _transferOwnership(address(0));
+    }
+
+    /**
+     * @dev Transfers ownership of the contract to a new account (`newOwner`).
+     * Can only be called by the current owner.
+     */
+    function transferOwnership(address newOwner) public virtual onlyOwner {
+        if (newOwner == address(0)) {
+            revert OwnableInvalidOwner(address(0));
+        }
+        _transferOwnership(newOwner);
+    }
+
+    /**
+     * @dev Transfers ownership of the contract to a new account (`newOwner`).
+     * Internal function without access restriction.
+     */
+    function _transferOwnership(address newOwner) internal virtual {
+        address oldOwner = _owner;
+        _owner = newOwner;
+        emit OwnershipTransferred(oldOwner, newOwner);
+    }
+}

third_party/real_code/rc17/sources/@openzeppelin/contracts/interfaces/IERC165.sol

@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/IERC165.sol)
+
+pragma solidity ^0.8.20;
+
+import {IERC165} from "../utils/introspection/IERC165.sol";

third_party/real_code/rc17/sources/@openzeppelin/contracts/interfaces/IERC4906.sol

@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.1.0) (interfaces/IERC4906.sol)
+
+pragma solidity ^0.8.20;
+
+import {IERC165} from "./IERC165.sol";
+import {IERC721} from "./IERC721.sol";
+
+/// @title ERC-721 Metadata Update Extension
+interface IERC4906 is IERC165, IERC721 {
+    /// @dev This event emits when the metadata of a token is changed.
+    /// So that the third-party platforms such as NFT market could
+    /// timely update the images and related attributes of the NFT.
+    event MetadataUpdate(uint256 _tokenId);
+
+    /// @dev This event emits when the metadata of a range of tokens is changed.
+    /// So that the third-party platforms such as NFT market could
+    /// timely update the images and related attributes of the NFTs.
+    event BatchMetadataUpdate(uint256 _fromTokenId, uint256 _toTokenId);
+}

third_party/real_code/rc17/sources/@openzeppelin/contracts/interfaces/IERC721.sol

@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/IERC721.sol)
+
+pragma solidity ^0.8.20;
+
+import {IERC721} from "../token/ERC721/IERC721.sol";

third_party/real_code/rc17/sources/@openzeppelin/contracts/interfaces/draft-IERC6093.sol

@@ -0,0 +1,161 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.1.0) (interfaces/draft-IERC6093.sol)
+pragma solidity ^0.8.20;
+
+/**
+ * @dev Standard ERC-20 Errors
+ * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC-20 tokens.
+ */
+interface IERC20Errors {
+    /**
+     * @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.
+     * @param sender Address whose tokens are being transferred.
+     * @param balance Current balance for the interacting account.
+     * @param needed Minimum amount required to perform a transfer.
+     */
+    error ERC20InsufficientBalance(address sender, uint256 balance, uint256 needed);
+
+    /**
+     * @dev Indicates a failure with the token `sender`. Used in transfers.
+     * @param sender Address whose tokens are being transferred.
+     */
+    error ERC20InvalidSender(address sender);
+
+    /**
+     * @dev Indicates a failure with the token `receiver`. Used in transfers.
+     * @param receiver Address to which tokens are being transferred.
+     */
+    error ERC20InvalidReceiver(address receiver);
+
+    /**
+     * @dev Indicates a failure with the `spender`’s `allowance`. Used in transfers.
+     * @param spender Address that may be allowed to operate on tokens without being their owner.
+     * @param allowance Amount of tokens a `spender` is allowed to operate with.
+     * @param needed Minimum amount required to perform a transfer.
+     */
+    error ERC20InsufficientAllowance(address spender, uint256 allowance, uint256 needed);
+
+    /**
+     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
+     * @param approver Address initiating an approval operation.
+     */
+    error ERC20InvalidApprover(address approver);
+
+    /**
+     * @dev Indicates a failure with the `spender` to be approved. Used in approvals.
+     * @param spender Address that may be allowed to operate on tokens without being their owner.
+     */
+    error ERC20InvalidSpender(address spender);
+}
+
+/**
+ * @dev Standard ERC-721 Errors
+ * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC-721 tokens.
+ */
+interface IERC721Errors {
+    /**
+     * @dev Indicates that an address can't be an owner. For example, `address(0)` is a forbidden owner in ERC-20.
+     * Used in balance queries.
+     * @param owner Address of the current owner of a token.
+     */
+    error ERC721InvalidOwner(address owner);
+
+    /**
+     * @dev Indicates a `tokenId` whose `owner` is the zero address.
+     * @param tokenId Identifier number of a token.
+     */
+    error ERC721NonexistentToken(uint256 tokenId);
+
+    /**
+     * @dev Indicates an error related to the ownership over a particular token. Used in transfers.
+     * @param sender Address whose tokens are being transferred.
+     * @param tokenId Identifier number of a token.
+     * @param owner Address of the current owner of a token.
+     */
+    error ERC721IncorrectOwner(address sender, uint256 tokenId, address owner);
+
+    /**
+     * @dev Indicates a failure with the token `sender`. Used in transfers.
+     * @param sender Address whose tokens are being transferred.
+     */
+    error ERC721InvalidSender(address sender);
+
+    /**
+     * @dev Indicates a failure with the token `receiver`. Used in transfers.
+     * @param receiver Address to which tokens are being transferred.
+     */
+    error ERC721InvalidReceiver(address receiver);
+
+    /**
+     * @dev Indicates a failure with the `operator`’s approval. Used in transfers.
+     * @param operator Address that may be allowed to operate on tokens without being their owner.
+     * @param tokenId Identifier number of a token.
+     */
+    error ERC721InsufficientApproval(address operator, uint256 tokenId);
+
+    /**
+     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
+     * @param approver Address initiating an approval operation.
+     */
+    error ERC721InvalidApprover(address approver);
+
+    /**
+     * @dev Indicates a failure with the `operator` to be approved. Used in approvals.
+     * @param operator Address that may be allowed to operate on tokens without being their owner.
+     */
+    error ERC721InvalidOperator(address operator);
+}
+
+/**
+ * @dev Standard ERC-1155 Errors
+ * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC-1155 tokens.
+ */
+interface IERC1155Errors {
+    /**
+     * @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.
+     * @param sender Address whose tokens are being transferred.
+     * @param balance Current balance for the interacting account.
+     * @param needed Minimum amount required to perform a transfer.
+     * @param tokenId Identifier number of a token.
+     */
+    error ERC1155InsufficientBalance(address sender, uint256 balance, uint256 needed, uint256 tokenId);
+
+    /**
+     * @dev Indicates a failure with the token `sender`. Used in transfers.
+     * @param sender Address whose tokens are being transferred.
+     */
+    error ERC1155InvalidSender(address sender);
+
+    /**
+     * @dev Indicates a failure with the token `receiver`. Used in transfers.
+     * @param receiver Address to which tokens are being transferred.
+     */
+    error ERC1155InvalidReceiver(address receiver);
+
+    /**
+     * @dev Indicates a failure with the `operator`’s approval. Used in transfers.
+     * @param operator Address that may be allowed to operate on tokens without being their owner.
+     * @param owner Address of the current owner of a token.
+     */
+    error ERC1155MissingApprovalForAll(address operator, address owner);
+
+    /**
+     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
+     * @param approver Address initiating an approval operation.
+     */
+    error ERC1155InvalidApprover(address approver);
+
+    /**
+     * @dev Indicates a failure with the `operator` to be approved. Used in approvals.
+     * @param operator Address that may be allowed to operate on tokens without being their owner.
+     */
+    error ERC1155InvalidOperator(address operator);
+
+    /**
+     * @dev Indicates an array length mismatch between ids and values in a safeBatchTransferFrom operation.
+     * Used in batch transfers.
+     * @param idsLength Length of the array of token identifiers
+     * @param valuesLength Length of the array of token amounts
+     */
+    error ERC1155InvalidArrayLength(uint256 idsLength, uint256 valuesLength);
+}

third_party/real_code/rc17/sources/@openzeppelin/contracts/token/ERC721/ERC721.sol

@@ -0,0 +1,456 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC721/ERC721.sol)
+
+pragma solidity ^0.8.20;
+
+import {IERC721} from "./IERC721.sol";
+import {IERC721Metadata} from "./extensions/IERC721Metadata.sol";
+import {ERC721Utils} from "./utils/ERC721Utils.sol";
+import {Context} from "../../utils/Context.sol";
+import {Strings} from "../../utils/Strings.sol";
+import {IERC165, ERC165} from "../../utils/introspection/ERC165.sol";
+import {IERC721Errors} from "../../interfaces/draft-IERC6093.sol";
+
+/**
+ * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC-721] Non-Fungible Token Standard, including
+ * the Metadata extension, but not including the Enumerable extension, which is available separately as
+ * {ERC721Enumerable}.
+ */
+abstract contract ERC721 is Context, ERC165, IERC721, IERC721Metadata, IERC721Errors {
+    using Strings for uint256;
+
+    // Token name
+    string private _name;
+
+    // Token symbol
+    string private _symbol;
+
+    mapping(uint256 tokenId => address) private _owners;
+
+    mapping(address owner => uint256) private _balances;
+
+    mapping(uint256 tokenId => address) private _tokenApprovals;
+
+    mapping(address owner => mapping(address operator => bool)) private _operatorApprovals;
+
+    /**
+     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
+     */
+    constructor(string memory name_, string memory symbol_) {
+        _name = name_;
+        _symbol = symbol_;
+    }
+
+    /**
+     * @dev See {IERC165-supportsInterface}.
+     */
+    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
+        return
+            interfaceId == type(IERC721).interfaceId ||
+            interfaceId == type(IERC721Metadata).interfaceId ||
+            super.supportsInterface(interfaceId);
+    }
+
+    /**
+     * @dev See {IERC721-balanceOf}.
+     */
+    function balanceOf(address owner) public view virtual returns (uint256) {
+        if (owner == address(0)) {
+            revert ERC721InvalidOwner(address(0));
+        }
+        return _balances[owner];
+    }
+
+    /**
+     * @dev See {IERC721-ownerOf}.
+     */
+    function ownerOf(uint256 tokenId) public view virtual returns (address) {
+        return _requireOwned(tokenId);
+    }
+
+    /**
+     * @dev See {IERC721Metadata-name}.
+     */
+    function name() public view virtual returns (string memory) {
+        return _name;
+    }
+
+    /**
+     * @dev See {IERC721Metadata-symbol}.
+     */
+    function symbol() public view virtual returns (string memory) {
+        return _symbol;
+    }
+
+    /**
+     * @dev See {IERC721Metadata-tokenURI}.
+     */
+    function tokenURI(uint256 tokenId) public view virtual returns (string memory) {
+        _requireOwned(tokenId);
+
+        string memory baseURI = _baseURI();
+        return bytes(baseURI).length > 0 ? string.concat(baseURI, tokenId.toString()) : "";
+    }
+
+    /**
+     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
+     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
+     * by default, can be overridden in child contracts.
+     */
+    function _baseURI() internal view virtual returns (string memory) {
+        return "";
+    }
+
+    /**
+     * @dev See {IERC721-approve}.
+     */
+    function approve(address to, uint256 tokenId) public virtual {
+        _approve(to, tokenId, _msgSender());
+    }
+
+    /**
+     * @dev See {IERC721-getApproved}.
+     */
+    function getApproved(uint256 tokenId) public view virtual returns (address) {
+        _requireOwned(tokenId);
+
+        return _getApproved(tokenId);
+    }
+
+    /**
+     * @dev See {IERC721-setApprovalForAll}.
+     */
+    function setApprovalForAll(address operator, bool approved) public virtual {
+        _setApprovalForAll(_msgSender(), operator, approved);
+    }
+
+    /**
+     * @dev See {IERC721-isApprovedForAll}.
+     */
+    function isApprovedForAll(address owner, address operator) public view virtual returns (bool) {
+        return _operatorApprovals[owner][operator];
+    }
+
+    /**
+     * @dev See {IERC721-transferFrom}.
+     */
+    function transferFrom(address from, address to, uint256 tokenId) public virtual {
+        if (to == address(0)) {
+            revert ERC721InvalidReceiver(address(0));
+        }
+        // Setting an "auth" arguments enables the `_isAuthorized` check which verifies that the token exists
+        // (from != 0). Therefore, it is not needed to verify that the return value is not 0 here.
+        address previousOwner = _update(to, tokenId, _msgSender());
+        if (previousOwner != from) {
+            revert ERC721IncorrectOwner(from, tokenId, previousOwner);
+        }
+    }
+
+    /**
+     * @dev See {IERC721-safeTransferFrom}.
+     */
+    function safeTransferFrom(address from, address to, uint256 tokenId) public {
+        safeTransferFrom(from, to, tokenId, "");
+    }
+
+    /**
+     * @dev See {IERC721-safeTransferFrom}.
+     */
+    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory data) public virtual {
+        transferFrom(from, to, tokenId);
+        ERC721Utils.checkOnERC721Received(_msgSender(), from, to, tokenId, data);
+    }
+
+    /**
+     * @dev Returns the owner of the `tokenId`. Does NOT revert if token doesn't exist
+     *
+     * IMPORTANT: Any overrides to this function that add ownership of tokens not tracked by the
+     * core ERC-721 logic MUST be matched with the use of {_increaseBalance} to keep balances
+     * consistent with ownership. The invariant to preserve is that for any address `a` the value returned by
+     * `balanceOf(a)` must be equal to the number of tokens such that `_ownerOf(tokenId)` is `a`.
+     */
+    function _ownerOf(uint256 tokenId) internal view virtual returns (address) {
+        return _owners[tokenId];
+    }
+
+    /**
+     * @dev Returns the approved address for `tokenId`. Returns 0 if `tokenId` is not minted.
+     */
+    function _getApproved(uint256 tokenId) internal view virtual returns (address) {
+        return _tokenApprovals[tokenId];
+    }
+
+    /**
+     * @dev Returns whether `spender` is allowed to manage `owner`'s tokens, or `tokenId` in
+     * particular (ignoring whether it is owned by `owner`).
+     *
+     * WARNING: This function assumes that `owner` is the actual owner of `tokenId` and does not verify this
+     * assumption.
+     */
+    function _isAuthorized(address owner, address spender, uint256 tokenId) internal view virtual returns (bool) {
+        return
+            spender != address(0) &&
+            (owner == spender || isApprovedForAll(owner, spender) || _getApproved(tokenId) == spender);
+    }
+
+    /**
+     * @dev Checks if `spender` can operate on `tokenId`, assuming the provided `owner` is the actual owner.
+     * Reverts if:
+     * - `spender` does not have approval from `owner` for `tokenId`.
+     * - `spender` does not have approval to manage all of `owner`'s assets.
+     *
+     * WARNING: This function assumes that `owner` is the actual owner of `tokenId` and does not verify this
+     * assumption.
+     */
+    function _checkAuthorized(address owner, address spender, uint256 tokenId) internal view virtual {
+        if (!_isAuthorized(owner, spender, tokenId)) {
+            if (owner == address(0)) {
+                revert ERC721NonexistentToken(tokenId);
+            } else {
+                revert ERC721InsufficientApproval(spender, tokenId);
+            }
+        }
+    }
+
+    /**
+     * @dev Unsafe write access to the balances, used by extensions that "mint" tokens using an {ownerOf} override.
+     *
+     * NOTE: the value is limited to type(uint128).max. This protect against _balance overflow. It is unrealistic that
+     * a uint256 would ever overflow from increments when these increments are bounded to uint128 values.
+     *
+     * WARNING: Increasing an account's balance using this function tends to be paired with an override of the
+     * {_ownerOf} function to resolve the ownership of the corresponding tokens so that balances and ownership
+     * remain consistent with one another.
+     */
+    function _increaseBalance(address account, uint128 value) internal virtual {
+        unchecked {
+            _balances[account] += value;
+        }
+    }
+
+    /**
+     * @dev Transfers `tokenId` from its current owner to `to`, or alternatively mints (or burns) if the current owner
+     * (or `to`) is the zero address. Returns the owner of the `tokenId` before the update.
+     *
+     * The `auth` argument is optional. If the value passed is non 0, then this function will check that
+     * `auth` is either the owner of the token, or approved to operate on the token (by the owner).
+     *
+     * Emits a {Transfer} event.
+     *
+     * NOTE: If overriding this function in a way that tracks balances, see also {_increaseBalance}.
+     */
+    function _update(address to, uint256 tokenId, address auth) internal virtual returns (address) {
+        address from = _ownerOf(tokenId);
+
+        // Perform (optional) operator check
+        if (auth != address(0)) {
+            _checkAuthorized(from, auth, tokenId);
+        }
+
+        // Execute the update
+        if (from != address(0)) {
+            // Clear approval. No need to re-authorize or emit the Approval event
+            _approve(address(0), tokenId, address(0), false);
+
+            unchecked {
+                _balances[from] -= 1;
+            }
+        }
+
+        if (to != address(0)) {
+            unchecked {
+                _balances[to] += 1;
+            }
+        }
+
+        _owners[tokenId] = to;
+
+        emit Transfer(from, to, tokenId);
+
+        return from;
+    }
+
+    /**
+     * @dev Mints `tokenId` and transfers it to `to`.
+     *
+     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
+     *
+     * Requirements:
+     *
+     * - `tokenId` must not exist.
+     * - `to` cannot be the zero address.
+     *
+     * Emits a {Transfer} event.
+     */
+    function _mint(address to, uint256 tokenId) internal {
+        if (to == address(0)) {
+            revert ERC721InvalidReceiver(address(0));
+        }
+        address previousOwner = _update(to, tokenId, address(0));
+        if (previousOwner != address(0)) {
+            revert ERC721InvalidSender(address(0));
+        }
+    }
+
+    /**
+     * @dev Mints `tokenId`, transfers it to `to` and checks for `to` acceptance.
+     *
+     * Requirements:
+     *
+     * - `tokenId` must not exist.
+     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
+     *
+     * Emits a {Transfer} event.
+     */
+    function _safeMint(address to, uint256 tokenId) internal {
+        _safeMint(to, tokenId, "");
+    }
+
+    /**
+     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
+     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
+     */
+    function _safeMint(address to, uint256 tokenId, bytes memory data) internal virtual {
+        _mint(to, tokenId);
+        ERC721Utils.checkOnERC721Received(_msgSender(), address(0), to, tokenId, data);
+    }
+
+    /**
+     * @dev Destroys `tokenId`.
+     * The approval is cleared when the token is burned.
+     * This is an internal function that does not check if the sender is authorized to operate on the token.
+     *
+     * Requirements:
+     *
+     * - `tokenId` must exist.
+     *
+     * Emits a {Transfer} event.
+     */
+    function _burn(uint256 tokenId) internal {
+        address previousOwner = _update(address(0), tokenId, address(0));
+        if (previousOwner == address(0)) {
+            revert ERC721NonexistentToken(tokenId);
+        }
+    }
+
+    /**
+     * @dev Transfers `tokenId` from `from` to `to`.
+     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
+     *
+     * Requirements:
+     *
+     * - `to` cannot be the zero address.
+     * - `tokenId` token must be owned by `from`.
+     *
+     * Emits a {Transfer} event.
+     */
+    function _transfer(address from, address to, uint256 tokenId) internal {
+        if (to == address(0)) {
+            revert ERC721InvalidReceiver(address(0));
+        }
+        address previousOwner = _update(to, tokenId, address(0));
+        if (previousOwner == address(0)) {
+            revert ERC721NonexistentToken(tokenId);
+        } else if (previousOwner != from) {
+            revert ERC721IncorrectOwner(from, tokenId, previousOwner);
+        }
+    }
+
+    /**
+     * @dev Safely transfers `tokenId` token from `from` to `to`, checking that contract recipients
+     * are aware of the ERC-721 standard to prevent tokens from being forever locked.
+     *
+     * `data` is additional data, it has no specified format and it is sent in call to `to`.
+     *
+     * This internal function is like {safeTransferFrom} in the sense that it invokes
+     * {IERC721Receiver-onERC721Received} on the receiver, and can be used to e.g.
+     * implement alternative mechanisms to perform token transfer, such as signature-based.
+     *
+     * Requirements:
+     *
+     * - `tokenId` token must exist and be owned by `from`.
+     * - `to` cannot be the zero address.
+     * - `from` cannot be the zero address.
+     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
+     *
+     * Emits a {Transfer} event.
+     */
+    function _safeTransfer(address from, address to, uint256 tokenId) internal {
+        _safeTransfer(from, to, tokenId, "");
+    }
+
+    /**
+     * @dev Same as {xref-ERC721-_safeTransfer-address-address-uint256-}[`_safeTransfer`], with an additional `data` parameter which is
+     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
+     */
+    function _safeTransfer(address from, address to, uint256 tokenId, bytes memory data) internal virtual {
+        _transfer(from, to, tokenId);
+        ERC721Utils.checkOnERC721Received(_msgSender(), from, to, tokenId, data);
+    }
+
+    /**
+     * @dev Approve `to` to operate on `tokenId`
+     *
+     * The `auth` argument is optional. If the value passed is non 0, then this function will check that `auth` is
+     * either the owner of the token, or approved to operate on all tokens held by this owner.
+     *
+     * Emits an {Approval} event.
+     *
+     * Overrides to this logic should be done to the variant with an additional `bool emitEvent` argument.
+     */
+    function _approve(address to, uint256 tokenId, address auth) internal {
+        _approve(to, tokenId, auth, true);
+    }
+
+    /**
+     * @dev Variant of `_approve` with an optional flag to enable or disable the {Approval} event. The event is not
+     * emitted in the context of transfers.
+     */
+    function _approve(address to, uint256 tokenId, address auth, bool emitEvent) internal virtual {
+        // Avoid reading the owner unless necessary
+        if (emitEvent || auth != address(0)) {
+            address owner = _requireOwned(tokenId);
+
+            // We do not use _isAuthorized because single-token approvals should not be able to call approve
+            if (auth != address(0) && owner != auth && !isApprovedForAll(owner, auth)) {
+                revert ERC721InvalidApprover(auth);
+            }
+
+            if (emitEvent) {
+                emit Approval(owner, to, tokenId);
+            }
+        }
+
+        _tokenApprovals[tokenId] = to;
+    }
+
+    /**
+     * @dev Approve `operator` to operate on all of `owner` tokens
+     *
+     * Requirements:
+     * - operator can't be the address zero.
+     *
+     * Emits an {ApprovalForAll} event.
+     */
+    function _setApprovalForAll(address owner, address operator, bool approved) internal virtual {
+        if (operator == address(0)) {
+            revert ERC721InvalidOperator(operator);
+        }
+        _operatorApprovals[owner][operator] = approved;
+        emit ApprovalForAll(owner, operator, approved);
+    }
+
+    /**
+     * @dev Reverts if the `tokenId` doesn't have a current owner (it hasn't been minted, or it has been burned).
+     * Returns the owner.
+     *
+     * Overrides to ownership logic should be done to {_ownerOf}.
+     */
+    function _requireOwned(uint256 tokenId) internal view returns (address) {
+        address owner = _ownerOf(tokenId);
+        if (owner == address(0)) {
+            revert ERC721NonexistentToken(tokenId);
+        }
+        return owner;
+    }
+}

third_party/real_code/rc17/sources/@openzeppelin/contracts/token/ERC721/IERC721.sol

@@ -0,0 +1,135 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC721/IERC721.sol)
+
+pragma solidity ^0.8.20;
+
+import {IERC165} from "../../utils/introspection/IERC165.sol";
+
+/**
+ * @dev Required interface of an ERC-721 compliant contract.
+ */
+interface IERC721 is IERC165 {
+    /**
+     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
+     */
+    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
+
+    /**
+     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
+     */
+    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
+
+    /**
+     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
+     */
+    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
+
+    /**
+     * @dev Returns the number of tokens in ``owner``'s account.
+     */
+    function balanceOf(address owner) external view returns (uint256 balance);
+
+    /**
+     * @dev Returns the owner of the `tokenId` token.
+     *
+     * Requirements:
+     *
+     * - `tokenId` must exist.
+     */
+    function ownerOf(uint256 tokenId) external view returns (address owner);
+
+    /**
+     * @dev Safely transfers `tokenId` token from `from` to `to`.
+     *
+     * Requirements:
+     *
+     * - `from` cannot be the zero address.
+     * - `to` cannot be the zero address.
+     * - `tokenId` token must exist and be owned by `from`.
+     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
+     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon
+     *   a safe transfer.
+     *
+     * Emits a {Transfer} event.
+     */
+    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;
+
+    /**
+     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
+     * are aware of the ERC-721 protocol to prevent tokens from being forever locked.
+     *
+     * Requirements:
+     *
+     * - `from` cannot be the zero address.
+     * - `to` cannot be the zero address.
+     * - `tokenId` token must exist and be owned by `from`.
+     * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or
+     *   {setApprovalForAll}.
+     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon
+     *   a safe transfer.
+     *
+     * Emits a {Transfer} event.
+     */
+    function safeTransferFrom(address from, address to, uint256 tokenId) external;
+
+    /**
+     * @dev Transfers `tokenId` token from `from` to `to`.
+     *
+     * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC-721
+     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
+     * understand this adds an external call which potentially creates a reentrancy vulnerability.
+     *
+     * Requirements:
+     *
+     * - `from` cannot be the zero address.
+     * - `to` cannot be the zero address.
+     * - `tokenId` token must be owned by `from`.
+     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
+     *
+     * Emits a {Transfer} event.
+     */
+    function transferFrom(address from, address to, uint256 tokenId) external;
+
+    /**
+     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
+     * The approval is cleared when the token is transferred.
+     *
+     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
+     *
+     * Requirements:
+     *
+     * - The caller must own the token or be an approved operator.
+     * - `tokenId` must exist.
+     *
+     * Emits an {Approval} event.
+     */
+    function approve(address to, uint256 tokenId) external;
+
+    /**
+     * @dev Approve or remove `operator` as an operator for the caller.
+     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
+     *
+     * Requirements:
+     *
+     * - The `operator` cannot be the address zero.
+     *
+     * Emits an {ApprovalForAll} event.
+     */
+    function setApprovalForAll(address operator, bool approved) external;
+
+    /**
+     * @dev Returns the account approved for `tokenId` token.
+     *
+     * Requirements:
+     *
+     * - `tokenId` must exist.
+     */
+    function getApproved(uint256 tokenId) external view returns (address operator);
+
+    /**
+     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
+     *
+     * See {setApprovalForAll}
+     */
+    function isApprovedForAll(address owner, address operator) external view returns (bool);
+}

third_party/real_code/rc17/sources/@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol

@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC721/IERC721Receiver.sol)
+
+pragma solidity ^0.8.20;
+
+/**
+ * @title ERC-721 token receiver interface
+ * @dev Interface for any contract that wants to support safeTransfers
+ * from ERC-721 asset contracts.
+ */
+interface IERC721Receiver {
+    /**
+     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
+     * by `operator` from `from`, this function is called.
+     *
+     * It must return its Solidity selector to confirm the token transfer.
+     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be
+     * reverted.
+     *
+     * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.
+     */
+    function onERC721Received(
+        address operator,
+        address from,
+        uint256 tokenId,
+        bytes calldata data
+    ) external returns (bytes4);
+}

third_party/real_code/rc17/sources/@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol

@@ -0,0 +1,174 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC721/extensions/ERC721Enumerable.sol)
+
+pragma solidity ^0.8.20;
+
+import {ERC721} from "../ERC721.sol";
+import {IERC721Enumerable} from "./IERC721Enumerable.sol";
+import {IERC165} from "../../../utils/introspection/ERC165.sol";
+
+/**
+ * @dev This implements an optional extension of {ERC721} defined in the ERC that adds enumerability
+ * of all the token ids in the contract as well as all token ids owned by each account.
+ *
+ * CAUTION: {ERC721} extensions that implement custom `balanceOf` logic, such as {ERC721Consecutive},
+ * interfere with enumerability and should not be used together with {ERC721Enumerable}.
+ */
+abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
+    mapping(address owner => mapping(uint256 index => uint256)) private _ownedTokens;
+    mapping(uint256 tokenId => uint256) private _ownedTokensIndex;
+
+    uint256[] private _allTokens;
+    mapping(uint256 tokenId => uint256) private _allTokensIndex;
+
+    /**
+     * @dev An `owner`'s token query was out of bounds for `index`.
+     *
+     * NOTE: The owner being `address(0)` indicates a global out of bounds index.
+     */
+    error ERC721OutOfBoundsIndex(address owner, uint256 index);
+
+    /**
+     * @dev Batch mint is not allowed.
+     */
+    error ERC721EnumerableForbiddenBatchMint();
+
+    /**
+     * @dev See {IERC165-supportsInterface}.
+     */
+    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
+        return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);
+    }
+
+    /**
+     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
+     */
+    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual returns (uint256) {
+        if (index >= balanceOf(owner)) {
+            revert ERC721OutOfBoundsIndex(owner, index);
+        }
+        return _ownedTokens[owner][index];
+    }
+
+    /**
+     * @dev See {IERC721Enumerable-totalSupply}.
+     */
+    function totalSupply() public view virtual returns (uint256) {
+        return _allTokens.length;
+    }
+
+    /**
+     * @dev See {IERC721Enumerable-tokenByIndex}.
+     */
+    function tokenByIndex(uint256 index) public view virtual returns (uint256) {
+        if (index >= totalSupply()) {
+            revert ERC721OutOfBoundsIndex(address(0), index);
+        }
+        return _allTokens[index];
+    }
+
+    /**
+     * @dev See {ERC721-_update}.
+     */
+    function _update(address to, uint256 tokenId, address auth) internal virtual override returns (address) {
+        address previousOwner = super._update(to, tokenId, auth);
+
+        if (previousOwner == address(0)) {
+            _addTokenToAllTokensEnumeration(tokenId);
+        } else if (previousOwner != to) {
+            _removeTokenFromOwnerEnumeration(previousOwner, tokenId);
+        }
+        if (to == address(0)) {
+            _removeTokenFromAllTokensEnumeration(tokenId);
+        } else if (previousOwner != to) {
+            _addTokenToOwnerEnumeration(to, tokenId);
+        }
+
+        return previousOwner;
+    }
+
+    /**
+     * @dev Private function to add a token to this extension's ownership-tracking data structures.
+     * @param to address representing the new owner of the given token ID
+     * @param tokenId uint256 ID of the token to be added to the tokens list of the given address
+     */
+    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
+        uint256 length = balanceOf(to) - 1;
+        _ownedTokens[to][length] = tokenId;
+        _ownedTokensIndex[tokenId] = length;
+    }
+
+    /**
+     * @dev Private function to add a token to this extension's token tracking data structures.
+     * @param tokenId uint256 ID of the token to be added to the tokens list
+     */
+    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
+        _allTokensIndex[tokenId] = _allTokens.length;
+        _allTokens.push(tokenId);
+    }
+
+    /**
+     * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
+     * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for
+     * gas optimizations e.g. when performing a transfer operation (avoiding double writes).
+     * This has O(1) time complexity, but alters the order of the _ownedTokens array.
+     * @param from address representing the previous owner of the given token ID
+     * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
+     */
+    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
+        // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
+        // then delete the last slot (swap and pop).
+
+        uint256 lastTokenIndex = balanceOf(from);
+        uint256 tokenIndex = _ownedTokensIndex[tokenId];
+
+        mapping(uint256 index => uint256) storage _ownedTokensByOwner = _ownedTokens[from];
+
+        // When the token to delete is the last token, the swap operation is unnecessary
+        if (tokenIndex != lastTokenIndex) {
+            uint256 lastTokenId = _ownedTokensByOwner[lastTokenIndex];
+
+            _ownedTokensByOwner[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
+            _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
+        }
+
+        // This also deletes the contents at the last position of the array
+        delete _ownedTokensIndex[tokenId];
+        delete _ownedTokensByOwner[lastTokenIndex];
+    }
+
+    /**
+     * @dev Private function to remove a token from this extension's token tracking data structures.
+     * This has O(1) time complexity, but alters the order of the _allTokens array.
+     * @param tokenId uint256 ID of the token to be removed from the tokens list
+     */
+    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
+        // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
+        // then delete the last slot (swap and pop).
+
+        uint256 lastTokenIndex = _allTokens.length - 1;
+        uint256 tokenIndex = _allTokensIndex[tokenId];
+
+        // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
+        // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
+        // an 'if' statement (like in _removeTokenFromOwnerEnumeration)
+        uint256 lastTokenId = _allTokens[lastTokenIndex];
+
+        _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
+        _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
+
+        // This also deletes the contents at the last position of the array
+        delete _allTokensIndex[tokenId];
+        _allTokens.pop();
+    }
+
+    /**
+     * See {ERC721-_increaseBalance}. We need that to account tokens that were minted in batch
+     */
+    function _increaseBalance(address account, uint128 amount) internal virtual override {
+        if (amount > 0) {
+            revert ERC721EnumerableForbiddenBatchMint();
+        }
+        super._increaseBalance(account, amount);
+    }
+}

third_party/real_code/rc17/sources/@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol

@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.3.0) (token/ERC721/extensions/ERC721URIStorage.sol)
+
+pragma solidity ^0.8.20;
+
+import {ERC721} from "../ERC721.sol";
+import {Strings} from "../../../utils/Strings.sol";
+import {IERC4906} from "../../../interfaces/IERC4906.sol";
+import {IERC165} from "../../../interfaces/IERC165.sol";
+
+/**
+ * @dev ERC-721 token with storage based token URI management.
+ */
+abstract contract ERC721URIStorage is IERC4906, ERC721 {
+    using Strings for uint256;
+
+    // Interface ID as defined in ERC-4906. This does not correspond to a traditional interface ID as ERC-4906 only
+    // defines events and does not include any external function.
+    bytes4 private constant ERC4906_INTERFACE_ID = bytes4(0x49064906);
+
+    // Optional mapping for token URIs
+    mapping(uint256 tokenId => string) private _tokenURIs;
+
+    /**
+     * @dev See {IERC165-supportsInterface}
+     */
+    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC721, IERC165) returns (bool) {
+        return interfaceId == ERC4906_INTERFACE_ID || super.supportsInterface(interfaceId);
+    }
+
+    /**
+     * @dev See {IERC721Metadata-tokenURI}.
+     */
+    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
+        _requireOwned(tokenId);
+
+        string memory _tokenURI = _tokenURIs[tokenId];
+        string memory base = _baseURI();
+
+        // If there is no base URI, return the token URI.
+        if (bytes(base).length == 0) {
+            return _tokenURI;
+        }
+        // If both are set, concatenate the baseURI and tokenURI (via string.concat).
+        if (bytes(_tokenURI).length > 0) {
+            return string.concat(base, _tokenURI);
+        }
+
+        return super.tokenURI(tokenId);
+    }
+
+    /**
+     * @dev Sets `_tokenURI` as the tokenURI of `tokenId`.
+     *
+     * Emits {IERC4906-MetadataUpdate}.
+     */
+    function _setTokenURI(uint256 tokenId, string memory _tokenURI) internal virtual {
+        _tokenURIs[tokenId] = _tokenURI;
+        emit MetadataUpdate(tokenId);
+    }
+}

third_party/real_code/rc17/sources/@openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol

@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC721/extensions/IERC721Enumerable.sol)
+
+pragma solidity ^0.8.20;
+
+import {IERC721} from "../IERC721.sol";
+
+/**
+ * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
+ * @dev See https://eips.ethereum.org/EIPS/eip-721
+ */
+interface IERC721Enumerable is IERC721 {
+    /**
+     * @dev Returns the total amount of tokens stored by the contract.
+     */
+    function totalSupply() external view returns (uint256);
+
+    /**
+     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
+     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
+     */
+    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256);
+
+    /**
+     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
+     * Use along with {totalSupply} to enumerate all tokens.
+     */
+    function tokenByIndex(uint256 index) external view returns (uint256);
+}

third_party/real_code/rc17/sources/@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol

@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC721/extensions/IERC721Metadata.sol)
+
+pragma solidity ^0.8.20;
+
+import {IERC721} from "../IERC721.sol";
+
+/**
+ * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
+ * @dev See https://eips.ethereum.org/EIPS/eip-721
+ */
+interface IERC721Metadata is IERC721 {
+    /**
+     * @dev Returns the token collection name.
+     */
+    function name() external view returns (string memory);
+
+    /**
+     * @dev Returns the token collection symbol.
+     */
+    function symbol() external view returns (string memory);
+
+    /**
+     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
+     */
+    function tokenURI(uint256 tokenId) external view returns (string memory);
+}

third_party/real_code/rc17/sources/@openzeppelin/contracts/token/ERC721/utils/ERC721Utils.sol

@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.3.0) (token/ERC721/utils/ERC721Utils.sol)
+
+pragma solidity ^0.8.20;
+
+import {IERC721Receiver} from "../IERC721Receiver.sol";
+import {IERC721Errors} from "../../../interfaces/draft-IERC6093.sol";
+
+/**
+ * @dev Library that provide common ERC-721 utility functions.
+ *
+ * See https://eips.ethereum.org/EIPS/eip-721[ERC-721].
+ *
+ * _Available since v5.1._
+ */
+library ERC721Utils {
+    /**
+     * @dev Performs an acceptance check for the provided `operator` by calling {IERC721Receiver-onERC721Received}
+     * on the `to` address. The `operator` is generally the address that initiated the token transfer (i.e. `msg.sender`).
+     *
+     * The acceptance call is not executed and treated as a no-op if the target address doesn't contain code (i.e. an EOA).
+     * Otherwise, the recipient must implement {IERC721Receiver-onERC721Received} and return the acceptance magic value to accept
+     * the transfer.
+     */
+    function checkOnERC721Received(
+        address operator,
+        address from,
+        address to,
+        uint256 tokenId,
+        bytes memory data
+    ) internal {
+        if (to.code.length > 0) {
+            try IERC721Receiver(to).onERC721Received(operator, from, tokenId, data) returns (bytes4 retval) {
+                if (retval != IERC721Receiver.onERC721Received.selector) {
+                    // Token rejected
+                    revert IERC721Errors.ERC721InvalidReceiver(to);
+                }
+            } catch (bytes memory reason) {
+                if (reason.length == 0) {
+                    // non-IERC721Receiver implementer
+                    revert IERC721Errors.ERC721InvalidReceiver(to);
+                } else {
+                    assembly ("memory-safe") {
+                        revert(add(32, reason), mload(reason))
+                    }
+                }
+            }
+        }
+    }
+}

third_party/real_code/rc17/sources/@openzeppelin/contracts/utils/Context.sol

@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)
+
+pragma solidity ^0.8.20;
+
+/**
+ * @dev Provides information about the current execution context, including the
+ * sender of the transaction and its data. While these are generally available
+ * via msg.sender and msg.data, they should not be accessed in such a direct
+ * manner, since when dealing with meta-transactions the account sending and
+ * paying for execution may not be the actual sender (as far as an application
+ * is concerned).
+ *
+ * This contract is only required for intermediate, library-like contracts.
+ */
+abstract contract Context {
+    function _msgSender() internal view virtual returns (address) {
+        return msg.sender;
+    }
+
+    function _msgData() internal view virtual returns (bytes calldata) {
+        return msg.data;
+    }
+
+    function _contextSuffixLength() internal view virtual returns (uint256) {
+        return 0;
+    }
+}

third_party/real_code/rc17/sources/@openzeppelin/contracts/utils/Panic.sol

@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.1.0) (utils/Panic.sol)
+
+pragma solidity ^0.8.20;
+
+/**
+ * @dev Helper library for emitting standardized panic codes.
+ *
+ * ```solidity
+ * contract Example {
+ *      using Panic for uint256;
+ *
+ *      // Use any of the declared internal constants
+ *      function foo() { Panic.GENERIC.panic(); }
+ *
+ *      // Alternatively
+ *      function foo() { Panic.panic(Panic.GENERIC); }
+ * }
+ * ```
+ *
+ * Follows the list from https://github.com/ethereum/solidity/blob/v0.8.24/libsolutil/ErrorCodes.h[libsolutil].
+ *
+ * _Available since v5.1._
+ */
+// slither-disable-next-line unused-state
+library Panic {
+    /// @dev generic / unspecified error
+    uint256 internal constant GENERIC = 0x00;
+    /// @dev used by the assert() builtin
+    uint256 internal constant ASSERT = 0x01;
+    /// @dev arithmetic underflow or overflow
+    uint256 internal constant UNDER_OVERFLOW = 0x11;
+    /// @dev division or modulo by zero
+    uint256 internal constant DIVISION_BY_ZERO = 0x12;
+    /// @dev enum conversion error
+    uint256 internal constant ENUM_CONVERSION_ERROR = 0x21;
+    /// @dev invalid encoding in storage
+    uint256 internal constant STORAGE_ENCODING_ERROR = 0x22;
+    /// @dev empty array pop
+    uint256 internal constant EMPTY_ARRAY_POP = 0x31;
+    /// @dev array out of bounds access
+    uint256 internal constant ARRAY_OUT_OF_BOUNDS = 0x32;
+    /// @dev resource error (too large allocation or too large array)
+    uint256 internal constant RESOURCE_ERROR = 0x41;
+    /// @dev calling invalid internal function
+    uint256 internal constant INVALID_INTERNAL_FUNCTION = 0x51;
+
+    /// @dev Reverts with a panic code. Recommended to use with
+    /// the internal constants with predefined codes.
+    function panic(uint256 code) internal pure {
+        assembly ("memory-safe") {
+            mstore(0x00, 0x4e487b71)
+            mstore(0x20, code)
+            revert(0x1c, 0x24)
+        }
+    }
+}

third_party/real_code/rc17/sources/@openzeppelin/contracts/utils/Strings.sol

@@ -0,0 +1,490 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.3.0) (utils/Strings.sol)
+
+pragma solidity ^0.8.20;
+
+import {Math} from "./math/Math.sol";
+import {SafeCast} from "./math/SafeCast.sol";
+import {SignedMath} from "./math/SignedMath.sol";
+
+/**
+ * @dev String operations.
+ */
+library Strings {
+    using SafeCast for *;
+
+    bytes16 private constant HEX_DIGITS = "0123456789abcdef";
+    uint8 private constant ADDRESS_LENGTH = 20;
+    uint256 private constant SPECIAL_CHARS_LOOKUP =
+        (1 << 0x08) | // backspace
+            (1 << 0x09) | // tab
+            (1 << 0x0a) | // newline
+            (1 << 0x0c) | // form feed
+            (1 << 0x0d) | // carriage return
+            (1 << 0x22) | // double quote
+            (1 << 0x5c); // backslash
+
+    /**
+     * @dev The `value` string doesn't fit in the specified `length`.
+     */
+    error StringsInsufficientHexLength(uint256 value, uint256 length);
+
+    /**
+     * @dev The string being parsed contains characters that are not in scope of the given base.
+     */
+    error StringsInvalidChar();
+
+    /**
+     * @dev The string being parsed is not a properly formatted address.
+     */
+    error StringsInvalidAddressFormat();
+
+    /**
+     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
+     */
+    function toString(uint256 value) internal pure returns (string memory) {
+        unchecked {
+            uint256 length = Math.log10(value) + 1;
+            string memory buffer = new string(length);
+            uint256 ptr;
+            assembly ("memory-safe") {
+                ptr := add(buffer, add(32, length))
+            }
+            while (true) {
+                ptr--;
+                assembly ("memory-safe") {
+                    mstore8(ptr, byte(mod(value, 10), HEX_DIGITS))
+                }
+                value /= 10;
+                if (value == 0) break;
+            }
+            return buffer;
+        }
+    }
+
+    /**
+     * @dev Converts a `int256` to its ASCII `string` decimal representation.
+     */
+    function toStringSigned(int256 value) internal pure returns (string memory) {
+        return string.concat(value < 0 ? "-" : "", toString(SignedMath.abs(value)));
+    }
+
+    /**
+     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
+     */
+    function toHexString(uint256 value) internal pure returns (string memory) {
+        unchecked {
+            return toHexString(value, Math.log256(value) + 1);
+        }
+    }
+
+    /**
+     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
+     */
+    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
+        uint256 localValue = value;
+        bytes memory buffer = new bytes(2 * length + 2);
+        buffer[0] = "0";
+        buffer[1] = "x";
+        for (uint256 i = 2 * length + 1; i > 1; --i) {
+            buffer[i] = HEX_DIGITS[localValue & 0xf];
+            localValue >>= 4;
+        }
+        if (localValue != 0) {
+            revert StringsInsufficientHexLength(value, length);
+        }
+        return string(buffer);
+    }
+
+    /**
+     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal
+     * representation.
+     */
+    function toHexString(address addr) internal pure returns (string memory) {
+        return toHexString(uint256(uint160(addr)), ADDRESS_LENGTH);
+    }
+
+    /**
+     * @dev Converts an `address` with fixed length of 20 bytes to its checksummed ASCII `string` hexadecimal
+     * representation, according to EIP-55.
+     */
+    function toChecksumHexString(address addr) internal pure returns (string memory) {
+        bytes memory buffer = bytes(toHexString(addr));
+
+        // hash the hex part of buffer (skip length + 2 bytes, length 40)
+        uint256 hashValue;
+        assembly ("memory-safe") {
+            hashValue := shr(96, keccak256(add(buffer, 0x22), 40))
+        }
+
+        for (uint256 i = 41; i > 1; --i) {
+            // possible values for buffer[i] are 48 (0) to 57 (9) and 97 (a) to 102 (f)
+            if (hashValue & 0xf > 7 && uint8(buffer[i]) > 96) {
+                // case shift by xoring with 0x20
+                buffer[i] ^= 0x20;
+            }
+            hashValue >>= 4;
+        }
+        return string(buffer);
+    }
+
+    /**
+     * @dev Returns true if the two strings are equal.
+     */
+    function equal(string memory a, string memory b) internal pure returns (bool) {
+        return bytes(a).length == bytes(b).length && keccak256(bytes(a)) == keccak256(bytes(b));
+    }
+
+    /**
+     * @dev Parse a decimal string and returns the value as a `uint256`.
+     *
+     * Requirements:
+     * - The string must be formatted as `[0-9]*`
+     * - The result must fit into an `uint256` type
+     */
+    function parseUint(string memory input) internal pure returns (uint256) {
+        return parseUint(input, 0, bytes(input).length);
+    }
+
+    /**
+     * @dev Variant of {parseUint-string} that parses a substring of `input` located between position `begin` (included) and
+     * `end` (excluded).
+     *
+     * Requirements:
+     * - The substring must be formatted as `[0-9]*`
+     * - The result must fit into an `uint256` type
+     */
+    function parseUint(string memory input, uint256 begin, uint256 end) internal pure returns (uint256) {
+        (bool success, uint256 value) = tryParseUint(input, begin, end);
+        if (!success) revert StringsInvalidChar();
+        return value;
+    }
+
+    /**
+     * @dev Variant of {parseUint-string} that returns false if the parsing fails because of an invalid character.
+     *
+     * NOTE: This function will revert if the result does not fit in a `uint256`.
+     */
+    function tryParseUint(string memory input) internal pure returns (bool success, uint256 value) {
+        return _tryParseUintUncheckedBounds(input, 0, bytes(input).length);
+    }
+
+    /**
+     * @dev Variant of {parseUint-string-uint256-uint256} that returns false if the parsing fails because of an invalid
+     * character.
+     *
+     * NOTE: This function will revert if the result does not fit in a `uint256`.
+     */
+    function tryParseUint(
+        string memory input,
+        uint256 begin,
+        uint256 end
+    ) internal pure returns (bool success, uint256 value) {
+        if (end > bytes(input).length || begin > end) return (false, 0);
+        return _tryParseUintUncheckedBounds(input, begin, end);
+    }
+
+    /**
+     * @dev Implementation of {tryParseUint-string-uint256-uint256} that does not check bounds. Caller should make sure that
+     * `begin <= end <= input.length`. Other inputs would result in undefined behavior.
+     */
+    function _tryParseUintUncheckedBounds(
+        string memory input,
+        uint256 begin,
+        uint256 end
+    ) private pure returns (bool success, uint256 value) {
+        bytes memory buffer = bytes(input);
+
+        uint256 result = 0;
+        for (uint256 i = begin; i < end; ++i) {
+            uint8 chr = _tryParseChr(bytes1(_unsafeReadBytesOffset(buffer, i)));
+            if (chr > 9) return (false, 0);
+            result *= 10;
+            result += chr;
+        }
+        return (true, result);
+    }
+
+    /**
+     * @dev Parse a decimal string and returns the value as a `int256`.
+     *
+     * Requirements:
+     * - The string must be formatted as `[-+]?[0-9]*`
+     * - The result must fit in an `int256` type.
+     */
+    function parseInt(string memory input) internal pure returns (int256) {
+        return parseInt(input, 0, bytes(input).length);
+    }
+
+    /**
+     * @dev Variant of {parseInt-string} that parses a substring of `input` located between position `begin` (included) and
+     * `end` (excluded).
+     *
+     * Requirements:
+     * - The substring must be formatted as `[-+]?[0-9]*`
+     * - The result must fit in an `int256` type.
+     */
+    function parseInt(string memory input, uint256 begin, uint256 end) internal pure returns (int256) {
+        (bool success, int256 value) = tryParseInt(input, begin, end);
+        if (!success) revert StringsInvalidChar();
+        return value;
+    }
+
+    /**
+     * @dev Variant of {parseInt-string} that returns false if the parsing fails because of an invalid character or if
+     * the result does not fit in a `int256`.
+     *
+     * NOTE: This function will revert if the absolute value of the result does not fit in a `uint256`.
+     */
+    function tryParseInt(string memory input) internal pure returns (bool success, int256 value) {
+        return _tryParseIntUncheckedBounds(input, 0, bytes(input).length);
+    }
+
+    uint256 private constant ABS_MIN_INT256 = 2 ** 255;
+
+    /**
+     * @dev Variant of {parseInt-string-uint256-uint256} that returns false if the parsing fails because of an invalid
+     * character or if the result does not fit in a `int256`.
+     *
+     * NOTE: This function will revert if the absolute value of the result does not fit in a `uint256`.
+     */
+    function tryParseInt(
+        string memory input,
+        uint256 begin,
+        uint256 end
+    ) internal pure returns (bool success, int256 value) {
+        if (end > bytes(input).length || begin > end) return (false, 0);
+        return _tryParseIntUncheckedBounds(input, begin, end);
+    }
+
+    /**
+     * @dev Implementation of {tryParseInt-string-uint256-uint256} that does not check bounds. Caller should make sure that
+     * `begin <= end <= input.length`. Other inputs would result in undefined behavior.
+     */
+    function _tryParseIntUncheckedBounds(
+        string memory input,
+        uint256 begin,
+        uint256 end
+    ) private pure returns (bool success, int256 value) {
+        bytes memory buffer = bytes(input);
+
+        // Check presence of a negative sign.
+        bytes1 sign = begin == end ? bytes1(0) : bytes1(_unsafeReadBytesOffset(buffer, begin)); // don't do out-of-bound (possibly unsafe) read if sub-string is empty
+        bool positiveSign = sign == bytes1("+");
+        bool negativeSign = sign == bytes1("-");
+        uint256 offset = (positiveSign || negativeSign).toUint();
+
+        (bool absSuccess, uint256 absValue) = tryParseUint(input, begin + offset, end);
+
+        if (absSuccess && absValue < ABS_MIN_INT256) {
+            return (true, negativeSign ? -int256(absValue) : int256(absValue));
+        } else if (absSuccess && negativeSign && absValue == ABS_MIN_INT256) {
+            return (true, type(int256).min);
+        } else return (false, 0);
+    }
+
+    /**
+     * @dev Parse a hexadecimal string (with or without "0x" prefix), and returns the value as a `uint256`.
+     *
+     * Requirements:
+     * - The string must be formatted as `(0x)?[0-9a-fA-F]*`
+     * - The result must fit in an `uint256` type.
+     */
+    function parseHexUint(string memory input) internal pure returns (uint256) {
+        return parseHexUint(input, 0, bytes(input).length);
+    }
+
+    /**
+     * @dev Variant of {parseHexUint-string} that parses a substring of `input` located between position `begin` (included) and
+     * `end` (excluded).
+     *
+     * Requirements:
+     * - The substring must be formatted as `(0x)?[0-9a-fA-F]*`
+     * - The result must fit in an `uint256` type.
+     */
+    function parseHexUint(string memory input, uint256 begin, uint256 end) internal pure returns (uint256) {
+        (bool success, uint256 value) = tryParseHexUint(input, begin, end);
+        if (!success) revert StringsInvalidChar();
+        return value;
+    }
+
+    /**
+     * @dev Variant of {parseHexUint-string} that returns false if the parsing fails because of an invalid character.
+     *
+     * NOTE: This function will revert if the result does not fit in a `uint256`.
+     */
+    function tryParseHexUint(string memory input) internal pure returns (bool success, uint256 value) {
+        return _tryParseHexUintUncheckedBounds(input, 0, bytes(input).length);
+    }
+
+    /**
+     * @dev Variant of {parseHexUint-string-uint256-uint256} that returns false if the parsing fails because of an
+     * invalid character.
+     *
+     * NOTE: This function will revert if the result does not fit in a `uint256`.
+     */
+    function tryParseHexUint(
+        string memory input,
+        uint256 begin,
+        uint256 end
+    ) internal pure returns (bool success, uint256 value) {
+        if (end > bytes(input).length || begin > end) return (false, 0);
+        return _tryParseHexUintUncheckedBounds(input, begin, end);
+    }
+
+    /**
+     * @dev Implementation of {tryParseHexUint-string-uint256-uint256} that does not check bounds. Caller should make sure that
+     * `begin <= end <= input.length`. Other inputs would result in undefined behavior.
+     */
+    function _tryParseHexUintUncheckedBounds(
+        string memory input,
+        uint256 begin,
+        uint256 end
+    ) private pure returns (bool success, uint256 value) {
+        bytes memory buffer = bytes(input);
+
+        // skip 0x prefix if present
+        bool hasPrefix = (end > begin + 1) && bytes2(_unsafeReadBytesOffset(buffer, begin)) == bytes2("0x"); // don't do out-of-bound (possibly unsafe) read if sub-string is empty
+        uint256 offset = hasPrefix.toUint() * 2;
+
+        uint256 result = 0;
+        for (uint256 i = begin + offset; i < end; ++i) {
+            uint8 chr = _tryParseChr(bytes1(_unsafeReadBytesOffset(buffer, i)));
+            if (chr > 15) return (false, 0);
+            result *= 16;
+            unchecked {
+                // Multiplying by 16 is equivalent to a shift of 4 bits (with additional overflow check).
+                // This guarantees that adding a value < 16 will not cause an overflow, hence the unchecked.
+                result += chr;
+            }
+        }
+        return (true, result);
+    }
+
+    /**
+     * @dev Parse a hexadecimal string (with or without "0x" prefix), and returns the value as an `address`.
+     *
+     * Requirements:
+     * - The string must be formatted as `(0x)?[0-9a-fA-F]{40}`
+     */
+    function parseAddress(string memory input) internal pure returns (address) {
+        return parseAddress(input, 0, bytes(input).length);
+    }
+
+    /**
+     * @dev Variant of {parseAddress-string} that parses a substring of `input` located between position `begin` (included) and
+     * `end` (excluded).
+     *
+     * Requirements:
+     * - The substring must be formatted as `(0x)?[0-9a-fA-F]{40}`
+     */
+    function parseAddress(string memory input, uint256 begin, uint256 end) internal pure returns (address) {
+        (bool success, address value) = tryParseAddress(input, begin, end);
+        if (!success) revert StringsInvalidAddressFormat();
+        return value;
+    }
+
+    /**
+     * @dev Variant of {parseAddress-string} that returns false if the parsing fails because the input is not a properly
+     * formatted address. See {parseAddress-string} requirements.
+     */
+    function tryParseAddress(string memory input) internal pure returns (bool success, address value) {
+        return tryParseAddress(input, 0, bytes(input).length);
+    }
+
+    /**
+     * @dev Variant of {parseAddress-string-uint256-uint256} that returns false if the parsing fails because input is not a properly
+     * formatted address. See {parseAddress-string-uint256-uint256} requirements.
+     */
+    function tryParseAddress(
+        string memory input,
+        uint256 begin,
+        uint256 end
+    ) internal pure returns (bool success, address value) {
+        if (end > bytes(input).length || begin > end) return (false, address(0));
+
+        bool hasPrefix = (end > begin + 1) && bytes2(_unsafeReadBytesOffset(bytes(input), begin)) == bytes2("0x"); // don't do out-of-bound (possibly unsafe) read if sub-string is empty
+        uint256 expectedLength = 40 + hasPrefix.toUint() * 2;
+
+        // check that input is the correct length
+        if (end - begin == expectedLength) {
+            // length guarantees that this does not overflow, and value is at most type(uint160).max
+            (bool s, uint256 v) = _tryParseHexUintUncheckedBounds(input, begin, end);
+            return (s, address(uint160(v)));
+        } else {
+            return (false, address(0));
+        }
+    }
+
+    function _tryParseChr(bytes1 chr) private pure returns (uint8) {
+        uint8 value = uint8(chr);
+
+        // Try to parse `chr`:
+        // - Case 1: [0-9]
+        // - Case 2: [a-f]
+        // - Case 3: [A-F]
+        // - otherwise not supported
+        unchecked {
+            if (value > 47 && value < 58) value -= 48;
+            else if (value > 96 && value < 103) value -= 87;
+            else if (value > 64 && value < 71) value -= 55;
+            else return type(uint8).max;
+        }
+
+        return value;
+    }
+
+    /**
+     * @dev Escape special characters in JSON strings. This can be useful to prevent JSON injection in NFT metadata.
+     *
+     * WARNING: This function should only be used in double quoted JSON strings. Single quotes are not escaped.
+     *
+     * NOTE: This function escapes all unicode characters, and not just the ones in ranges defined in section 2.5 of
+     * RFC-4627 (U+0000 to U+001F, U+0022 and U+005C). ECMAScript's `JSON.parse` does recover escaped unicode
+     * characters that are not in this range, but other tooling may provide different results.
+     */
+    function escapeJSON(string memory input) internal pure returns (string memory) {
+        bytes memory buffer = bytes(input);
+        bytes memory output = new bytes(2 * buffer.length); // worst case scenario
+        uint256 outputLength = 0;
+
+        for (uint256 i; i < buffer.length; ++i) {
+            bytes1 char = bytes1(_unsafeReadBytesOffset(buffer, i));
+            if (((SPECIAL_CHARS_LOOKUP & (1 << uint8(char))) != 0)) {
+                output[outputLength++] = "\\";
+                if (char == 0x08) output[outputLength++] = "b";
+                else if (char == 0x09) output[outputLength++] = "t";
+                else if (char == 0x0a) output[outputLength++] = "n";
+                else if (char == 0x0c) output[outputLength++] = "f";
+                else if (char == 0x0d) output[outputLength++] = "r";
+                else if (char == 0x5c) output[outputLength++] = "\\";
+                else if (char == 0x22) {
+                    // solhint-disable-next-line quotes
+                    output[outputLength++] = '"';
+                }
+            } else {
+                output[outputLength++] = char;
+            }
+        }
+        // write the actual length and deallocate unused memory
+        assembly ("memory-safe") {
+            mstore(output, outputLength)
+            mstore(0x40, add(output, shl(5, shr(5, add(outputLength, 63)))))
+        }
+
+        return string(output);
+    }
+
+    /**
+     * @dev Reads a bytes32 from a bytes array without bounds checking.
+     *
+     * NOTE: making this function internal would mean it could be used with memory unsafe offset, and marking the
+     * assembly block as such would prevent some optimizations.
+     */
+    function _unsafeReadBytesOffset(bytes memory buffer, uint256 offset) private pure returns (bytes32 value) {
+        // This is not memory safe in the general case, but all calls to this private function are within bounds.
+        assembly ("memory-safe") {
+            value := mload(add(buffer, add(0x20, offset)))
+        }
+    }
+}

third_party/real_code/rc17/sources/@openzeppelin/contracts/utils/introspection/ERC165.sol

@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.1.0) (utils/introspection/ERC165.sol)
+
+pragma solidity ^0.8.20;
+
+import {IERC165} from "./IERC165.sol";
+
+/**
+ * @dev Implementation of the {IERC165} interface.
+ *
+ * Contracts that want to implement ERC-165 should inherit from this contract and override {supportsInterface} to check
+ * for the additional interface id that will be supported. For example:
+ *
+ * ```solidity
+ * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
+ *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
+ * }
+ * ```
+ */
+abstract contract ERC165 is IERC165 {
+    /**
+     * @dev See {IERC165-supportsInterface}.
+     */
+    function supportsInterface(bytes4 interfaceId) public view virtual returns (bool) {
+        return interfaceId == type(IERC165).interfaceId;
+    }
+}

third_party/real_code/rc17/sources/@openzeppelin/contracts/utils/introspection/IERC165.sol

@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.1.0) (utils/introspection/IERC165.sol)
+
+pragma solidity ^0.8.20;
+
+/**
+ * @dev Interface of the ERC-165 standard, as defined in the
+ * https://eips.ethereum.org/EIPS/eip-165[ERC].
+ *
+ * Implementers can declare support of contract interfaces, which can then be
+ * queried by others ({ERC165Checker}).
+ *
+ * For an implementation, see {ERC165}.
+ */
+interface IERC165 {
+    /**
+     * @dev Returns true if this contract implements the interface defined by
+     * `interfaceId`. See the corresponding
+     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[ERC section]
+     * to learn more about how these ids are created.
+     *
+     * This function call must use less than 30 000 gas.
+     */
+    function supportsInterface(bytes4 interfaceId) external view returns (bool);
+}

third_party/real_code/rc17/sources/@openzeppelin/contracts/utils/math/Math.sol

@@ -0,0 +1,749 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.3.0) (utils/math/Math.sol)
+
+pragma solidity ^0.8.20;
+
+import {Panic} from "../Panic.sol";
+import {SafeCast} from "./SafeCast.sol";
+
+/**
+ * @dev Standard math utilities missing in the Solidity language.
+ */
+library Math {
+    enum Rounding {
+        Floor, // Toward negative infinity
+        Ceil, // Toward positive infinity
+        Trunc, // Toward zero
+        Expand // Away from zero
+    }
+
+    /**
+     * @dev Return the 512-bit addition of two uint256.
+     *
+     * The result is stored in two 256 variables such that sum = high * 2²⁵⁶ + low.
+     */
+    function add512(uint256 a, uint256 b) internal pure returns (uint256 high, uint256 low) {
+        assembly ("memory-safe") {
+            low := add(a, b)
+            high := lt(low, a)
+        }
+    }
+
+    /**
+     * @dev Return the 512-bit multiplication of two uint256.
+     *
+     * The result is stored in two 256 variables such that product = high * 2²⁵⁶ + low.
+     */
+    function mul512(uint256 a, uint256 b) internal pure returns (uint256 high, uint256 low) {
+        // 512-bit multiply [high low] = x * y. Compute the product mod 2²⁵⁶ and mod 2²⁵⁶ - 1, then use
+        // the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
+        // variables such that product = high * 2²⁵⁶ + low.
+        assembly ("memory-safe") {
+            let mm := mulmod(a, b, not(0))
+            low := mul(a, b)
+            high := sub(sub(mm, low), lt(mm, low))
+        }
+    }
+
+    /**
+     * @dev Returns the addition of two unsigned integers, with a success flag (no overflow).
+     */
+    function tryAdd(uint256 a, uint256 b) internal pure returns (bool success, uint256 result) {
+        unchecked {
+            uint256 c = a + b;
+            success = c >= a;
+            result = c * SafeCast.toUint(success);
+        }
+    }
+
+    /**
+     * @dev Returns the subtraction of two unsigned integers, with a success flag (no overflow).
+     */
+    function trySub(uint256 a, uint256 b) internal pure returns (bool success, uint256 result) {
+        unchecked {
+            uint256 c = a - b;
+            success = c <= a;
+            result = c * SafeCast.toUint(success);
+        }
+    }
+
+    /**
+     * @dev Returns the multiplication of two unsigned integers, with a success flag (no overflow).
+     */
+    function tryMul(uint256 a, uint256 b) internal pure returns (bool success, uint256 result) {
+        unchecked {
+            uint256 c = a * b;
+            assembly ("memory-safe") {
+                // Only true when the multiplication doesn't overflow
+                // (c / a == b) || (a == 0)
+                success := or(eq(div(c, a), b), iszero(a))
+            }
+            // equivalent to: success ? c : 0
+            result = c * SafeCast.toUint(success);
+        }
+    }
+
+    /**
+     * @dev Returns the division of two unsigned integers, with a success flag (no division by zero).
+     */
+    function tryDiv(uint256 a, uint256 b) internal pure returns (bool success, uint256 result) {
+        unchecked {
+            success = b > 0;
+            assembly ("memory-safe") {
+                // The `DIV` opcode returns zero when the denominator is 0.
+                result := div(a, b)
+            }
+        }
+    }
+
+    /**
+     * @dev Returns the remainder of dividing two unsigned integers, with a success flag (no division by zero).
+     */
+    function tryMod(uint256 a, uint256 b) internal pure returns (bool success, uint256 result) {
+        unchecked {
+            success = b > 0;
+            assembly ("memory-safe") {
+                // The `MOD` opcode returns zero when the denominator is 0.
+                result := mod(a, b)
+            }
+        }
+    }
+
+    /**
+     * @dev Unsigned saturating addition, bounds to `2²⁵⁶ - 1` instead of overflowing.
+     */
+    function saturatingAdd(uint256 a, uint256 b) internal pure returns (uint256) {
+        (bool success, uint256 result) = tryAdd(a, b);
+        return ternary(success, result, type(uint256).max);
+    }
+
+    /**
+     * @dev Unsigned saturating subtraction, bounds to zero instead of overflowing.
+     */
+    function saturatingSub(uint256 a, uint256 b) internal pure returns (uint256) {
+        (, uint256 result) = trySub(a, b);
+        return result;
+    }
+
+    /**
+     * @dev Unsigned saturating multiplication, bounds to `2²⁵⁶ - 1` instead of overflowing.
+     */
+    function saturatingMul(uint256 a, uint256 b) internal pure returns (uint256) {
+        (bool success, uint256 result) = tryMul(a, b);
+        return ternary(success, result, type(uint256).max);
+    }
+
+    /**
+     * @dev Branchless ternary evaluation for `a ? b : c`. Gas costs are constant.
+     *
+     * IMPORTANT: This function may reduce bytecode size and consume less gas when used standalone.
+     * However, the compiler may optimize Solidity ternary operations (i.e. `a ? b : c`) to only compute
+     * one branch when needed, making this function more expensive.
+     */
+    function ternary(bool condition, uint256 a, uint256 b) internal pure returns (uint256) {
+        unchecked {
+            // branchless ternary works because:
+            // b ^ (a ^ b) == a
+            // b ^ 0 == b
+            return b ^ ((a ^ b) * SafeCast.toUint(condition));
+        }
+    }
+
+    /**
+     * @dev Returns the largest of two numbers.
+     */
+    function max(uint256 a, uint256 b) internal pure returns (uint256) {
+        return ternary(a > b, a, b);
+    }
+
+    /**
+     * @dev Returns the smallest of two numbers.
+     */
+    function min(uint256 a, uint256 b) internal pure returns (uint256) {
+        return ternary(a < b, a, b);
+    }
+
+    /**
+     * @dev Returns the average of two numbers. The result is rounded towards
+     * zero.
+     */
+    function average(uint256 a, uint256 b) internal pure returns (uint256) {
+        // (a + b) / 2 can overflow.
+        return (a & b) + (a ^ b) / 2;
+    }
+
+    /**
+     * @dev Returns the ceiling of the division of two numbers.
+     *
+     * This differs from standard division with `/` in that it rounds towards infinity instead
+     * of rounding towards zero.
+     */
+    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
+        if (b == 0) {
+            // Guarantee the same behavior as in a regular Solidity division.
+            Panic.panic(Panic.DIVISION_BY_ZERO);
+        }
+
+        // The following calculation ensures accurate ceiling division without overflow.
+        // Since a is non-zero, (a - 1) / b will not overflow.
+        // The largest possible result occurs when (a - 1) / b is type(uint256).max,
+        // but the largest value we can obtain is type(uint256).max - 1, which happens
+        // when a = type(uint256).max and b = 1.
+        unchecked {
+            return SafeCast.toUint(a > 0) * ((a - 1) / b + 1);
+        }
+    }
+
+    /**
+     * @dev Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or
+     * denominator == 0.
+     *
+     * Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv) with further edits by
+     * Uniswap Labs also under MIT license.
+     */
+    function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
+        unchecked {
+            (uint256 high, uint256 low) = mul512(x, y);
+
+            // Handle non-overflow cases, 256 by 256 division.
+            if (high == 0) {
+                // Solidity will revert if denominator == 0, unlike the div opcode on its own.
+                // The surrounding unchecked block does not change this fact.
+                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
+                return low / denominator;
+            }
+
+            // Make sure the result is less than 2²⁵⁶. Also prevents denominator == 0.
+            if (denominator <= high) {
+                Panic.panic(ternary(denominator == 0, Panic.DIVISION_BY_ZERO, Panic.UNDER_OVERFLOW));
+            }
+
+            ///////////////////////////////////////////////
+            // 512 by 256 division.
+            ///////////////////////////////////////////////
+
+            // Make division exact by subtracting the remainder from [high low].
+            uint256 remainder;
+            assembly ("memory-safe") {
+                // Compute remainder using mulmod.
+                remainder := mulmod(x, y, denominator)
+
+                // Subtract 256 bit number from 512 bit number.
+                high := sub(high, gt(remainder, low))
+                low := sub(low, remainder)
+            }
+
+            // Factor powers of two out of denominator and compute largest power of two divisor of denominator.
+            // Always >= 1. See https://cs.stackexchange.com/q/138556/92363.
+
+            uint256 twos = denominator & (0 - denominator);
+            assembly ("memory-safe") {
+                // Divide denominator by twos.
+                denominator := div(denominator, twos)
+
+                // Divide [high low] by twos.
+                low := div(low, twos)
+
+                // Flip twos such that it is 2²⁵⁶ / twos. If twos is zero, then it becomes one.
+                twos := add(div(sub(0, twos), twos), 1)
+            }
+
+            // Shift in bits from high into low.
+            low |= high * twos;
+
+            // Invert denominator mod 2²⁵⁶. Now that denominator is an odd number, it has an inverse modulo 2²⁵⁶ such
+            // that denominator * inv ≡ 1 mod 2²⁵⁶. Compute the inverse by starting with a seed that is correct for
+            // four bits. That is, denominator * inv ≡ 1 mod 2⁴.
+            uint256 inverse = (3 * denominator) ^ 2;
+
+            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also
+            // works in modular arithmetic, doubling the correct bits in each step.
+            inverse *= 2 - denominator * inverse; // inverse mod 2⁸
+            inverse *= 2 - denominator * inverse; // inverse mod 2¹⁶
+            inverse *= 2 - denominator * inverse; // inverse mod 2³²
+            inverse *= 2 - denominator * inverse; // inverse mod 2⁶⁴
+            inverse *= 2 - denominator * inverse; // inverse mod 2¹²⁸
+            inverse *= 2 - denominator * inverse; // inverse mod 2²⁵⁶
+
+            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
+            // This will give us the correct result modulo 2²⁵⁶. Since the preconditions guarantee that the outcome is
+            // less than 2²⁵⁶, this is the final result. We don't need to compute the high bits of the result and high
+            // is no longer required.
+            result = low * inverse;
+            return result;
+        }
+    }
+
+    /**
+     * @dev Calculates x * y / denominator with full precision, following the selected rounding direction.
+     */
+    function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
+        return mulDiv(x, y, denominator) + SafeCast.toUint(unsignedRoundsUp(rounding) && mulmod(x, y, denominator) > 0);
+    }
+
+    /**
+     * @dev Calculates floor(x * y >> n) with full precision. Throws if result overflows a uint256.
+     */
+    function mulShr(uint256 x, uint256 y, uint8 n) internal pure returns (uint256 result) {
+        unchecked {
+            (uint256 high, uint256 low) = mul512(x, y);
+            if (high >= 1 << n) {
+                Panic.panic(Panic.UNDER_OVERFLOW);
+            }
+            return (high << (256 - n)) | (low >> n);
+        }
+    }
+
+    /**
+     * @dev Calculates x * y >> n with full precision, following the selected rounding direction.
+     */
+    function mulShr(uint256 x, uint256 y, uint8 n, Rounding rounding) internal pure returns (uint256) {
+        return mulShr(x, y, n) + SafeCast.toUint(unsignedRoundsUp(rounding) && mulmod(x, y, 1 << n) > 0);
+    }
+
+    /**
+     * @dev Calculate the modular multiplicative inverse of a number in Z/nZ.
+     *
+     * If n is a prime, then Z/nZ is a field. In that case all elements are inversible, except 0.
+     * If n is not a prime, then Z/nZ is not a field, and some elements might not be inversible.
+     *
+     * If the input value is not inversible, 0 is returned.
+     *
+     * NOTE: If you know for sure that n is (big) a prime, it may be cheaper to use Fermat's little theorem and get the
+     * inverse using `Math.modExp(a, n - 2, n)`. See {invModPrime}.
+     */
+    function invMod(uint256 a, uint256 n) internal pure returns (uint256) {
+        unchecked {
+            if (n == 0) return 0;
+
+            // The inverse modulo is calculated using the Extended Euclidean Algorithm (iterative version)
+            // Used to compute integers x and y such that: ax + ny = gcd(a, n).
+            // When the gcd is 1, then the inverse of a modulo n exists and it's x.
+            // ax + ny = 1
+            // ax = 1 + (-y)n
+            // ax ≡ 1 (mod n) # x is the inverse of a modulo n
+
+            // If the remainder is 0 the gcd is n right away.
+            uint256 remainder = a % n;
+            uint256 gcd = n;
+
+            // Therefore the initial coefficients are:
+            // ax + ny = gcd(a, n) = n
+            // 0a + 1n = n
+            int256 x = 0;
+            int256 y = 1;
+
+            while (remainder != 0) {
+                uint256 quotient = gcd / remainder;
+
+                (gcd, remainder) = (
+                    // The old remainder is the next gcd to try.
+                    remainder,
+                    // Compute the next remainder.
+                    // Can't overflow given that (a % gcd) * (gcd // (a % gcd)) <= gcd
+                    // where gcd is at most n (capped to type(uint256).max)
+                    gcd - remainder * quotient
+                );
+
+                (x, y) = (
+                    // Increment the coefficient of a.
+                    y,
+                    // Decrement the coefficient of n.
+                    // Can overflow, but the result is casted to uint256 so that the
+                    // next value of y is "wrapped around" to a value between 0 and n - 1.
+                    x - y * int256(quotient)
+                );
+            }
+
+            if (gcd != 1) return 0; // No inverse exists.
+            return ternary(x < 0, n - uint256(-x), uint256(x)); // Wrap the result if it's negative.
+        }
+    }
+
+    /**
+     * @dev Variant of {invMod}. More efficient, but only works if `p` is known to be a prime greater than `2`.
+     *
+     * From https://en.wikipedia.org/wiki/Fermat%27s_little_theorem[Fermat's little theorem], we know that if p is
+     * prime, then `a**(p-1) ≡ 1 mod p`. As a consequence, we have `a * a**(p-2) ≡ 1 mod p`, which means that
+     * `a**(p-2)` is the modular multiplicative inverse of a in Fp.
+     *
+     * NOTE: this function does NOT check that `p` is a prime greater than `2`.
+     */
+    function invModPrime(uint256 a, uint256 p) internal view returns (uint256) {
+        unchecked {
+            return Math.modExp(a, p - 2, p);
+        }
+    }
+
+    /**
+     * @dev Returns the modular exponentiation of the specified base, exponent and modulus (b ** e % m)
+     *
+     * Requirements:
+     * - modulus can't be zero
+     * - underlying staticcall to precompile must succeed
+     *
+     * IMPORTANT: The result is only valid if the underlying call succeeds. When using this function, make
+     * sure the chain you're using it on supports the precompiled contract for modular exponentiation
+     * at address 0x05 as specified in https://eips.ethereum.org/EIPS/eip-198[EIP-198]. Otherwise,
+     * the underlying function will succeed given the lack of a revert, but the result may be incorrectly
+     * interpreted as 0.
+     */
+    function modExp(uint256 b, uint256 e, uint256 m) internal view returns (uint256) {
+        (bool success, uint256 result) = tryModExp(b, e, m);
+        if (!success) {
+            Panic.panic(Panic.DIVISION_BY_ZERO);
+        }
+        return result;
+    }
+
+    /**
+     * @dev Returns the modular exponentiation of the specified base, exponent and modulus (b ** e % m).
+     * It includes a success flag indicating if the operation succeeded. Operation will be marked as failed if trying
+     * to operate modulo 0 or if the underlying precompile reverted.
+     *
+     * IMPORTANT: The result is only valid if the success flag is true. When using this function, make sure the chain
+     * you're using it on supports the precompiled contract for modular exponentiation at address 0x05 as specified in
+     * https://eips.ethereum.org/EIPS/eip-198[EIP-198]. Otherwise, the underlying function will succeed given the lack
+     * of a revert, but the result may be incorrectly interpreted as 0.
+     */
+    function tryModExp(uint256 b, uint256 e, uint256 m) internal view returns (bool success, uint256 result) {
+        if (m == 0) return (false, 0);
+        assembly ("memory-safe") {
+            let ptr := mload(0x40)
+            // | Offset    | Content    | Content (Hex)                                                      |
+            // |-----------|------------|--------------------------------------------------------------------|
+            // | 0x00:0x1f | size of b  | 0x0000000000000000000000000000000000000000000000000000000000000020 |
+            // | 0x20:0x3f | size of e  | 0x0000000000000000000000000000000000000000000000000000000000000020 |
+            // | 0x40:0x5f | size of m  | 0x0000000000000000000000000000000000000000000000000000000000000020 |
+            // | 0x60:0x7f | value of b | 0x<.............................................................b> |
+            // | 0x80:0x9f | value of e | 0x<.............................................................e> |
+            // | 0xa0:0xbf | value of m | 0x<.............................................................m> |
+            mstore(ptr, 0x20)
+            mstore(add(ptr, 0x20), 0x20)
+            mstore(add(ptr, 0x40), 0x20)
+            mstore(add(ptr, 0x60), b)
+            mstore(add(ptr, 0x80), e)
+            mstore(add(ptr, 0xa0), m)
+
+            // Given the result < m, it's guaranteed to fit in 32 bytes,
+            // so we can use the memory scratch space located at offset 0.
+            success := staticcall(gas(), 0x05, ptr, 0xc0, 0x00, 0x20)
+            result := mload(0x00)
+        }
+    }
+
+    /**
+     * @dev Variant of {modExp} that supports inputs of arbitrary length.
+     */
+    function modExp(bytes memory b, bytes memory e, bytes memory m) internal view returns (bytes memory) {
+        (bool success, bytes memory result) = tryModExp(b, e, m);
+        if (!success) {
+            Panic.panic(Panic.DIVISION_BY_ZERO);
+        }
+        return result;
+    }
+
+    /**
+     * @dev Variant of {tryModExp} that supports inputs of arbitrary length.
+     */
+    function tryModExp(
+        bytes memory b,
+        bytes memory e,
+        bytes memory m
+    ) internal view returns (bool success, bytes memory result) {
+        if (_zeroBytes(m)) return (false, new bytes(0));
+
+        uint256 mLen = m.length;
+
+        // Encode call args in result and move the free memory pointer
+        result = abi.encodePacked(b.length, e.length, mLen, b, e, m);
+
+        assembly ("memory-safe") {
+            let dataPtr := add(result, 0x20)
+            // Write result on top of args to avoid allocating extra memory.
+            success := staticcall(gas(), 0x05, dataPtr, mload(result), dataPtr, mLen)
+            // Overwrite the length.
+            // result.length > returndatasize() is guaranteed because returndatasize() == m.length
+            mstore(result, mLen)
+            // Set the memory pointer after the returned data.
+            mstore(0x40, add(dataPtr, mLen))
+        }
+    }
+
+    /**
+     * @dev Returns whether the provided byte array is zero.
+     */
+    function _zeroBytes(bytes memory byteArray) private pure returns (bool) {
+        for (uint256 i = 0; i < byteArray.length; ++i) {
+            if (byteArray[i] != 0) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    /**
+     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded
+     * towards zero.
+     *
+     * This method is based on Newton's method for computing square roots; the algorithm is restricted to only
+     * using integer operations.
+     */
+    function sqrt(uint256 a) internal pure returns (uint256) {
+        unchecked {
+            // Take care of easy edge cases when a == 0 or a == 1
+            if (a <= 1) {
+                return a;
+            }
+
+            // In this function, we use Newton's method to get a root of `f(x) := x² - a`. It involves building a
+            // sequence x_n that converges toward sqrt(a). For each iteration x_n, we also define the error between
+            // the current value as `ε_n = | x_n - sqrt(a) |`.
+            //
+            // For our first estimation, we consider `e` the smallest power of 2 which is bigger than the square root
+            // of the target. (i.e. `2**(e-1) ≤ sqrt(a) < 2**e`). We know that `e ≤ 128` because `(2¹²⁸)² = 2²⁵⁶` is
+            // bigger than any uint256.
+            //
+            // By noticing that
+            // `2**(e-1) ≤ sqrt(a) < 2**e → (2**(e-1))² ≤ a < (2**e)² → 2**(2*e-2) ≤ a < 2**(2*e)`
+            // we can deduce that `e - 1` is `log2(a) / 2`. We can thus compute `x_n = 2**(e-1)` using a method similar
+            // to the msb function.
+            uint256 aa = a;
+            uint256 xn = 1;
+
+            if (aa >= (1 << 128)) {
+                aa >>= 128;
+                xn <<= 64;
+            }
+            if (aa >= (1 << 64)) {
+                aa >>= 64;
+                xn <<= 32;
+            }
+            if (aa >= (1 << 32)) {
+                aa >>= 32;
+                xn <<= 16;
+            }
+            if (aa >= (1 << 16)) {
+                aa >>= 16;
+                xn <<= 8;
+            }
+            if (aa >= (1 << 8)) {
+                aa >>= 8;
+                xn <<= 4;
+            }
+            if (aa >= (1 << 4)) {
+                aa >>= 4;
+                xn <<= 2;
+            }
+            if (aa >= (1 << 2)) {
+                xn <<= 1;
+            }
+
+            // We now have x_n such that `x_n = 2**(e-1) ≤ sqrt(a) < 2**e = 2 * x_n`. This implies ε_n ≤ 2**(e-1).
+            //
+            // We can refine our estimation by noticing that the middle of that interval minimizes the error.
+            // If we move x_n to equal 2**(e-1) + 2**(e-2), then we reduce the error to ε_n ≤ 2**(e-2).
+            // This is going to be our x_0 (and ε_0)
+            xn = (3 * xn) >> 1; // ε_0 := | x_0 - sqrt(a) | ≤ 2**(e-2)
+
+            // From here, Newton's method give us:
+            // x_{n+1} = (x_n + a / x_n) / 2
+            //
+            // One should note that:
+            // x_{n+1}² - a = ((x_n + a / x_n) / 2)² - a
+            //              = ((x_n² + a) / (2 * x_n))² - a
+            //              = (x_n⁴ + 2 * a * x_n² + a²) / (4 * x_n²) - a
+            //              = (x_n⁴ + 2 * a * x_n² + a² - 4 * a * x_n²) / (4 * x_n²)
+            //              = (x_n⁴ - 2 * a * x_n² + a²) / (4 * x_n²)
+            //              = (x_n² - a)² / (2 * x_n)²
+            //              = ((x_n² - a) / (2 * x_n))²
+            //              ≥ 0
+            // Which proves that for all n ≥ 1, sqrt(a) ≤ x_n
+            //
+            // This gives us the proof of quadratic convergence of the sequence:
+            // ε_{n+1} = | x_{n+1} - sqrt(a) |
+            //         = | (x_n + a / x_n) / 2 - sqrt(a) |
+            //         = | (x_n² + a - 2*x_n*sqrt(a)) / (2 * x_n) |
+            //         = | (x_n - sqrt(a))² / (2 * x_n) |
+            //         = | ε_n² / (2 * x_n) |
+            //         = ε_n² / | (2 * x_n) |
+            //
+            // For the first iteration, we have a special case where x_0 is known:
+            // ε_1 = ε_0² / | (2 * x_0) |
+            //     ≤ (2**(e-2))² / (2 * (2**(e-1) + 2**(e-2)))
+            //     ≤ 2**(2*e-4) / (3 * 2**(e-1))
+            //     ≤ 2**(e-3) / 3
+            //     ≤ 2**(e-3-log2(3))
+            //     ≤ 2**(e-4.5)
+            //
+            // For the following iterations, we use the fact that, 2**(e-1) ≤ sqrt(a) ≤ x_n:
+            // ε_{n+1} = ε_n² / | (2 * x_n) |
+            //         ≤ (2**(e-k))² / (2 * 2**(e-1))
+            //         ≤ 2**(2*e-2*k) / 2**e
+            //         ≤ 2**(e-2*k)
+            xn = (xn + a / xn) >> 1; // ε_1 := | x_1 - sqrt(a) | ≤ 2**(e-4.5)  -- special case, see above
+            xn = (xn + a / xn) >> 1; // ε_2 := | x_2 - sqrt(a) | ≤ 2**(e-9)    -- general case with k = 4.5
+            xn = (xn + a / xn) >> 1; // ε_3 := | x_3 - sqrt(a) | ≤ 2**(e-18)   -- general case with k = 9
+            xn = (xn + a / xn) >> 1; // ε_4 := | x_4 - sqrt(a) | ≤ 2**(e-36)   -- general case with k = 18
+            xn = (xn + a / xn) >> 1; // ε_5 := | x_5 - sqrt(a) | ≤ 2**(e-72)   -- general case with k = 36
+            xn = (xn + a / xn) >> 1; // ε_6 := | x_6 - sqrt(a) | ≤ 2**(e-144)  -- general case with k = 72
+
+            // Because e ≤ 128 (as discussed during the first estimation phase), we know have reached a precision
+            // ε_6 ≤ 2**(e-144) < 1. Given we're operating on integers, then we can ensure that xn is now either
+            // sqrt(a) or sqrt(a) + 1.
+            return xn - SafeCast.toUint(xn > a / xn);
+        }
+    }
+
+    /**
+     * @dev Calculates sqrt(a), following the selected rounding direction.
+     */
+    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
+        unchecked {
+            uint256 result = sqrt(a);
+            return result + SafeCast.toUint(unsignedRoundsUp(rounding) && result * result < a);
+        }
+    }
+
+    /**
+     * @dev Return the log in base 2 of a positive value rounded towards zero.
+     * Returns 0 if given 0.
+     */
+    function log2(uint256 x) internal pure returns (uint256 r) {
+        // If value has upper 128 bits set, log2 result is at least 128
+        r = SafeCast.toUint(x > 0xffffffffffffffffffffffffffffffff) << 7;
+        // If upper 64 bits of 128-bit half set, add 64 to result
+        r |= SafeCast.toUint((x >> r) > 0xffffffffffffffff) << 6;
+        // If upper 32 bits of 64-bit half set, add 32 to result
+        r |= SafeCast.toUint((x >> r) > 0xffffffff) << 5;
+        // If upper 16 bits of 32-bit half set, add 16 to result
+        r |= SafeCast.toUint((x >> r) > 0xffff) << 4;
+        // If upper 8 bits of 16-bit half set, add 8 to result
+        r |= SafeCast.toUint((x >> r) > 0xff) << 3;
+        // If upper 4 bits of 8-bit half set, add 4 to result
+        r |= SafeCast.toUint((x >> r) > 0xf) << 2;
+
+        // Shifts value right by the current result and use it as an index into this lookup table:
+        //
+        // | x (4 bits) |  index  | table[index] = MSB position |
+        // |------------|---------|-----------------------------|
+        // |    0000    |    0    |        table[0] = 0         |
+        // |    0001    |    1    |        table[1] = 0         |
+        // |    0010    |    2    |        table[2] = 1         |
+        // |    0011    |    3    |        table[3] = 1         |
+        // |    0100    |    4    |        table[4] = 2         |
+        // |    0101    |    5    |        table[5] = 2         |
+        // |    0110    |    6    |        table[6] = 2         |
+        // |    0111    |    7    |        table[7] = 2         |
+        // |    1000    |    8    |        table[8] = 3         |
+        // |    1001    |    9    |        table[9] = 3         |
+        // |    1010    |   10    |        table[10] = 3        |
+        // |    1011    |   11    |        table[11] = 3        |
+        // |    1100    |   12    |        table[12] = 3        |
+        // |    1101    |   13    |        table[13] = 3        |
+        // |    1110    |   14    |        table[14] = 3        |
+        // |    1111    |   15    |        table[15] = 3        |
+        //
+        // The lookup table is represented as a 32-byte value with the MSB positions for 0-15 in the last 16 bytes.
+        assembly ("memory-safe") {
+            r := or(r, byte(shr(r, x), 0x0000010102020202030303030303030300000000000000000000000000000000))
+        }
+    }
+
+    /**
+     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
+     * Returns 0 if given 0.
+     */
+    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
+        unchecked {
+            uint256 result = log2(value);
+            return result + SafeCast.toUint(unsignedRoundsUp(rounding) && 1 << result < value);
+        }
+    }
+
+    /**
+     * @dev Return the log in base 10 of a positive value rounded towards zero.
+     * Returns 0 if given 0.
+     */
+    function log10(uint256 value) internal pure returns (uint256) {
+        uint256 result = 0;
+        unchecked {
+            if (value >= 10 ** 64) {
+                value /= 10 ** 64;
+                result += 64;
+            }
+            if (value >= 10 ** 32) {
+                value /= 10 ** 32;
+                result += 32;
+            }
+            if (value >= 10 ** 16) {
+                value /= 10 ** 16;
+                result += 16;
+            }
+            if (value >= 10 ** 8) {
+                value /= 10 ** 8;
+                result += 8;
+            }
+            if (value >= 10 ** 4) {
+                value /= 10 ** 4;
+                result += 4;
+            }
+            if (value >= 10 ** 2) {
+                value /= 10 ** 2;
+                result += 2;
+            }
+            if (value >= 10 ** 1) {
+                result += 1;
+            }
+        }
+        return result;
+    }
+
+    /**
+     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
+     * Returns 0 if given 0.
+     */
+    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
+        unchecked {
+            uint256 result = log10(value);
+            return result + SafeCast.toUint(unsignedRoundsUp(rounding) && 10 ** result < value);
+        }
+    }
+
+    /**
+     * @dev Return the log in base 256 of a positive value rounded towards zero.
+     * Returns 0 if given 0.
+     *
+     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
+     */
+    function log256(uint256 x) internal pure returns (uint256 r) {
+        // If value has upper 128 bits set, log2 result is at least 128
+        r = SafeCast.toUint(x > 0xffffffffffffffffffffffffffffffff) << 7;
+        // If upper 64 bits of 128-bit half set, add 64 to result
+        r |= SafeCast.toUint((x >> r) > 0xffffffffffffffff) << 6;
+        // If upper 32 bits of 64-bit half set, add 32 to result
+        r |= SafeCast.toUint((x >> r) > 0xffffffff) << 5;
+        // If upper 16 bits of 32-bit half set, add 16 to result
+        r |= SafeCast.toUint((x >> r) > 0xffff) << 4;
+        // Add 1 if upper 8 bits of 16-bit half set, and divide accumulated result by 8
+        return (r >> 3) | SafeCast.toUint((x >> r) > 0xff);
+    }
+
+    /**
+     * @dev Return the log in base 256, following the selected rounding direction, of a positive value.
+     * Returns 0 if given 0.
+     */
+    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
+        unchecked {
+            uint256 result = log256(value);
+            return result + SafeCast.toUint(unsignedRoundsUp(rounding) && 1 << (result << 3) < value);
+        }
+    }
+
+    /**
+     * @dev Returns whether a provided rounding mode is considered rounding up for unsigned integers.
+     */
+    function unsignedRoundsUp(Rounding rounding) internal pure returns (bool) {
+        return uint8(rounding) % 2 == 1;
+    }
+}

third_party/real_code/rc17/sources/@openzeppelin/contracts/utils/math/SafeCast.sol

@@ -0,0 +1,1162 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.1.0) (utils/math/SafeCast.sol)
+// This file was procedurally generated from scripts/generate/templates/SafeCast.js.
+
+pragma solidity ^0.8.20;
+
+/**
+ * @dev Wrappers over Solidity's uintXX/intXX/bool casting operators with added overflow
+ * checks.
+ *
+ * Downcasting from uint256/int256 in Solidity does not revert on overflow. This can
+ * easily result in undesired exploitation or bugs, since developers usually
+ * assume that overflows raise errors. `SafeCast` restores this intuition by
+ * reverting the transaction when such an operation overflows.
+ *
+ * Using this library instead of the unchecked operations eliminates an entire
+ * class of bugs, so it's recommended to use it always.
+ */
+library SafeCast {
+    /**
+     * @dev Value doesn't fit in an uint of `bits` size.
+     */
+    error SafeCastOverflowedUintDowncast(uint8 bits, uint256 value);
+
+    /**
+     * @dev An int value doesn't fit in an uint of `bits` size.
+     */
+    error SafeCastOverflowedIntToUint(int256 value);
+
+    /**
+     * @dev Value doesn't fit in an int of `bits` size.
+     */
+    error SafeCastOverflowedIntDowncast(uint8 bits, int256 value);
+
+    /**
+     * @dev An uint value doesn't fit in an int of `bits` size.
+     */
+    error SafeCastOverflowedUintToInt(uint256 value);
+
+    /**
+     * @dev Returns the downcasted uint248 from uint256, reverting on
+     * overflow (when the input is greater than largest uint248).
+     *
+     * Counterpart to Solidity's `uint248` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 248 bits
+     */
+    function toUint248(uint256 value) internal pure returns (uint248) {
+        if (value > type(uint248).max) {
+            revert SafeCastOverflowedUintDowncast(248, value);
+        }
+        return uint248(value);
+    }
+
+    /**
+     * @dev Returns the downcasted uint240 from uint256, reverting on
+     * overflow (when the input is greater than largest uint240).
+     *
+     * Counterpart to Solidity's `uint240` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 240 bits
+     */
+    function toUint240(uint256 value) internal pure returns (uint240) {
+        if (value > type(uint240).max) {
+            revert SafeCastOverflowedUintDowncast(240, value);
+        }
+        return uint240(value);
+    }
+
+    /**
+     * @dev Returns the downcasted uint232 from uint256, reverting on
+     * overflow (when the input is greater than largest uint232).
+     *
+     * Counterpart to Solidity's `uint232` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 232 bits
+     */
+    function toUint232(uint256 value) internal pure returns (uint232) {
+        if (value > type(uint232).max) {
+            revert SafeCastOverflowedUintDowncast(232, value);
+        }
+        return uint232(value);
+    }
+
+    /**
+     * @dev Returns the downcasted uint224 from uint256, reverting on
+     * overflow (when the input is greater than largest uint224).
+     *
+     * Counterpart to Solidity's `uint224` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 224 bits
+     */
+    function toUint224(uint256 value) internal pure returns (uint224) {
+        if (value > type(uint224).max) {
+            revert SafeCastOverflowedUintDowncast(224, value);
+        }
+        return uint224(value);
+    }
+
+    /**
+     * @dev Returns the downcasted uint216 from uint256, reverting on
+     * overflow (when the input is greater than largest uint216).
+     *
+     * Counterpart to Solidity's `uint216` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 216 bits
+     */
+    function toUint216(uint256 value) internal pure returns (uint216) {
+        if (value > type(uint216).max) {
+            revert SafeCastOverflowedUintDowncast(216, value);
+        }
+        return uint216(value);
+    }
+
+    /**
+     * @dev Returns the downcasted uint208 from uint256, reverting on
+     * overflow (when the input is greater than largest uint208).
+     *
+     * Counterpart to Solidity's `uint208` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 208 bits
+     */
+    function toUint208(uint256 value) internal pure returns (uint208) {
+        if (value > type(uint208).max) {
+            revert SafeCastOverflowedUintDowncast(208, value);
+        }
+        return uint208(value);
+    }
+
+    /**
+     * @dev Returns the downcasted uint200 from uint256, reverting on
+     * overflow (when the input is greater than largest uint200).
+     *
+     * Counterpart to Solidity's `uint200` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 200 bits
+     */
+    function toUint200(uint256 value) internal pure returns (uint200) {
+        if (value > type(uint200).max) {
+            revert SafeCastOverflowedUintDowncast(200, value);
+        }
+        return uint200(value);
+    }
+
+    /**
+     * @dev Returns the downcasted uint192 from uint256, reverting on
+     * overflow (when the input is greater than largest uint192).
+     *
+     * Counterpart to Solidity's `uint192` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 192 bits
+     */
+    function toUint192(uint256 value) internal pure returns (uint192) {
+        if (value > type(uint192).max) {
+            revert SafeCastOverflowedUintDowncast(192, value);
+        }
+        return uint192(value);
+    }
+
+    /**
+     * @dev Returns the downcasted uint184 from uint256, reverting on
+     * overflow (when the input is greater than largest uint184).
+     *
+     * Counterpart to Solidity's `uint184` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 184 bits
+     */
+    function toUint184(uint256 value) internal pure returns (uint184) {
+        if (value > type(uint184).max) {
+            revert SafeCastOverflowedUintDowncast(184, value);
+        }
+        return uint184(value);
+    }
+
+    /**
+     * @dev Returns the downcasted uint176 from uint256, reverting on
+     * overflow (when the input is greater than largest uint176).
+     *
+     * Counterpart to Solidity's `uint176` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 176 bits
+     */
+    function toUint176(uint256 value) internal pure returns (uint176) {
+        if (value > type(uint176).max) {
+            revert SafeCastOverflowedUintDowncast(176, value);
+        }
+        return uint176(value);
+    }
+
+    /**
+     * @dev Returns the downcasted uint168 from uint256, reverting on
+     * overflow (when the input is greater than largest uint168).
+     *
+     * Counterpart to Solidity's `uint168` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 168 bits
+     */
+    function toUint168(uint256 value) internal pure returns (uint168) {
+        if (value > type(uint168).max) {
+            revert SafeCastOverflowedUintDowncast(168, value);
+        }
+        return uint168(value);
+    }
+
+    /**
+     * @dev Returns the downcasted uint160 from uint256, reverting on
+     * overflow (when the input is greater than largest uint160).
+     *
+     * Counterpart to Solidity's `uint160` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 160 bits
+     */
+    function toUint160(uint256 value) internal pure returns (uint160) {
+        if (value > type(uint160).max) {
+            revert SafeCastOverflowedUintDowncast(160, value);
+        }
+        return uint160(value);
+    }
+
+    /**
+     * @dev Returns the downcasted uint152 from uint256, reverting on
+     * overflow (when the input is greater than largest uint152).
+     *
+     * Counterpart to Solidity's `uint152` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 152 bits
+     */
+    function toUint152(uint256 value) internal pure returns (uint152) {
+        if (value > type(uint152).max) {
+            revert SafeCastOverflowedUintDowncast(152, value);
+        }
+        return uint152(value);
+    }
+
+    /**
+     * @dev Returns the downcasted uint144 from uint256, reverting on
+     * overflow (when the input is greater than largest uint144).
+     *
+     * Counterpart to Solidity's `uint144` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 144 bits
+     */
+    function toUint144(uint256 value) internal pure returns (uint144) {
+        if (value > type(uint144).max) {
+            revert SafeCastOverflowedUintDowncast(144, value);
+        }
+        return uint144(value);
+    }
+
+    /**
+     * @dev Returns the downcasted uint136 from uint256, reverting on
+     * overflow (when the input is greater than largest uint136).
+     *
+     * Counterpart to Solidity's `uint136` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 136 bits
+     */
+    function toUint136(uint256 value) internal pure returns (uint136) {
+        if (value > type(uint136).max) {
+            revert SafeCastOverflowedUintDowncast(136, value);
+        }
+        return uint136(value);
+    }
+
+    /**
+     * @dev Returns the downcasted uint128 from uint256, reverting on
+     * overflow (when the input is greater than largest uint128).
+     *
+     * Counterpart to Solidity's `uint128` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 128 bits
+     */
+    function toUint128(uint256 value) internal pure returns (uint128) {
+        if (value > type(uint128).max) {
+            revert SafeCastOverflowedUintDowncast(128, value);
+        }
+        return uint128(value);
+    }
+
+    /**
+     * @dev Returns the downcasted uint120 from uint256, reverting on
+     * overflow (when the input is greater than largest uint120).
+     *
+     * Counterpart to Solidity's `uint120` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 120 bits
+     */
+    function toUint120(uint256 value) internal pure returns (uint120) {
+        if (value > type(uint120).max) {
+            revert SafeCastOverflowedUintDowncast(120, value);
+        }
+        return uint120(value);
+    }
+
+    /**
+     * @dev Returns the downcasted uint112 from uint256, reverting on
+     * overflow (when the input is greater than largest uint112).
+     *
+     * Counterpart to Solidity's `uint112` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 112 bits
+     */
+    function toUint112(uint256 value) internal pure returns (uint112) {
+        if (value > type(uint112).max) {
+            revert SafeCastOverflowedUintDowncast(112, value);
+        }
+        return uint112(value);
+    }
+
+    /**
+     * @dev Returns the downcasted uint104 from uint256, reverting on
+     * overflow (when the input is greater than largest uint104).
+     *
+     * Counterpart to Solidity's `uint104` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 104 bits
+     */
+    function toUint104(uint256 value) internal pure returns (uint104) {
+        if (value > type(uint104).max) {
+            revert SafeCastOverflowedUintDowncast(104, value);
+        }
+        return uint104(value);
+    }
+
+    /**
+     * @dev Returns the downcasted uint96 from uint256, reverting on
+     * overflow (when the input is greater than largest uint96).
+     *
+     * Counterpart to Solidity's `uint96` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 96 bits
+     */
+    function toUint96(uint256 value) internal pure returns (uint96) {
+        if (value > type(uint96).max) {
+            revert SafeCastOverflowedUintDowncast(96, value);
+        }
+        return uint96(value);
+    }
+
+    /**
+     * @dev Returns the downcasted uint88 from uint256, reverting on
+     * overflow (when the input is greater than largest uint88).
+     *
+     * Counterpart to Solidity's `uint88` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 88 bits
+     */
+    function toUint88(uint256 value) internal pure returns (uint88) {
+        if (value > type(uint88).max) {
+            revert SafeCastOverflowedUintDowncast(88, value);
+        }
+        return uint88(value);
+    }
+
+    /**
+     * @dev Returns the downcasted uint80 from uint256, reverting on
+     * overflow (when the input is greater than largest uint80).
+     *
+     * Counterpart to Solidity's `uint80` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 80 bits
+     */
+    function toUint80(uint256 value) internal pure returns (uint80) {
+        if (value > type(uint80).max) {
+            revert SafeCastOverflowedUintDowncast(80, value);
+        }
+        return uint80(value);
+    }
+
+    /**
+     * @dev Returns the downcasted uint72 from uint256, reverting on
+     * overflow (when the input is greater than largest uint72).
+     *
+     * Counterpart to Solidity's `uint72` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 72 bits
+     */
+    function toUint72(uint256 value) internal pure returns (uint72) {
+        if (value > type(uint72).max) {
+            revert SafeCastOverflowedUintDowncast(72, value);
+        }
+        return uint72(value);
+    }
+
+    /**
+     * @dev Returns the downcasted uint64 from uint256, reverting on
+     * overflow (when the input is greater than largest uint64).
+     *
+     * Counterpart to Solidity's `uint64` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 64 bits
+     */
+    function toUint64(uint256 value) internal pure returns (uint64) {
+        if (value > type(uint64).max) {
+            revert SafeCastOverflowedUintDowncast(64, value);
+        }
+        return uint64(value);
+    }
+
+    /**
+     * @dev Returns the downcasted uint56 from uint256, reverting on
+     * overflow (when the input is greater than largest uint56).
+     *
+     * Counterpart to Solidity's `uint56` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 56 bits
+     */
+    function toUint56(uint256 value) internal pure returns (uint56) {
+        if (value > type(uint56).max) {
+            revert SafeCastOverflowedUintDowncast(56, value);
+        }
+        return uint56(value);
+    }
+
+    /**
+     * @dev Returns the downcasted uint48 from uint256, reverting on
+     * overflow (when the input is greater than largest uint48).
+     *
+     * Counterpart to Solidity's `uint48` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 48 bits
+     */
+    function toUint48(uint256 value) internal pure returns (uint48) {
+        if (value > type(uint48).max) {
+            revert SafeCastOverflowedUintDowncast(48, value);
+        }
+        return uint48(value);
+    }
+
+    /**
+     * @dev Returns the downcasted uint40 from uint256, reverting on
+     * overflow (when the input is greater than largest uint40).
+     *
+     * Counterpart to Solidity's `uint40` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 40 bits
+     */
+    function toUint40(uint256 value) internal pure returns (uint40) {
+        if (value > type(uint40).max) {
+            revert SafeCastOverflowedUintDowncast(40, value);
+        }
+        return uint40(value);
+    }
+
+    /**
+     * @dev Returns the downcasted uint32 from uint256, reverting on
+     * overflow (when the input is greater than largest uint32).
+     *
+     * Counterpart to Solidity's `uint32` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 32 bits
+     */
+    function toUint32(uint256 value) internal pure returns (uint32) {
+        if (value > type(uint32).max) {
+            revert SafeCastOverflowedUintDowncast(32, value);
+        }
+        return uint32(value);
+    }
+
+    /**
+     * @dev Returns the downcasted uint24 from uint256, reverting on
+     * overflow (when the input is greater than largest uint24).
+     *
+     * Counterpart to Solidity's `uint24` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 24 bits
+     */
+    function toUint24(uint256 value) internal pure returns (uint24) {
+        if (value > type(uint24).max) {
+            revert SafeCastOverflowedUintDowncast(24, value);
+        }
+        return uint24(value);
+    }
+
+    /**
+     * @dev Returns the downcasted uint16 from uint256, reverting on
+     * overflow (when the input is greater than largest uint16).
+     *
+     * Counterpart to Solidity's `uint16` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 16 bits
+     */
+    function toUint16(uint256 value) internal pure returns (uint16) {
+        if (value > type(uint16).max) {
+            revert SafeCastOverflowedUintDowncast(16, value);
+        }
+        return uint16(value);
+    }
+
+    /**
+     * @dev Returns the downcasted uint8 from uint256, reverting on
+     * overflow (when the input is greater than largest uint8).
+     *
+     * Counterpart to Solidity's `uint8` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 8 bits
+     */
+    function toUint8(uint256 value) internal pure returns (uint8) {
+        if (value > type(uint8).max) {
+            revert SafeCastOverflowedUintDowncast(8, value);
+        }
+        return uint8(value);
+    }
+
+    /**
+     * @dev Converts a signed int256 into an unsigned uint256.
+     *
+     * Requirements:
+     *
+     * - input must be greater than or equal to 0.
+     */
+    function toUint256(int256 value) internal pure returns (uint256) {
+        if (value < 0) {
+            revert SafeCastOverflowedIntToUint(value);
+        }
+        return uint256(value);
+    }
+
+    /**
+     * @dev Returns the downcasted int248 from int256, reverting on
+     * overflow (when the input is less than smallest int248 or
+     * greater than largest int248).
+     *
+     * Counterpart to Solidity's `int248` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 248 bits
+     */
+    function toInt248(int256 value) internal pure returns (int248 downcasted) {
+        downcasted = int248(value);
+        if (downcasted != value) {
+            revert SafeCastOverflowedIntDowncast(248, value);
+        }
+    }
+
+    /**
+     * @dev Returns the downcasted int240 from int256, reverting on
+     * overflow (when the input is less than smallest int240 or
+     * greater than largest int240).
+     *
+     * Counterpart to Solidity's `int240` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 240 bits
+     */
+    function toInt240(int256 value) internal pure returns (int240 downcasted) {
+        downcasted = int240(value);
+        if (downcasted != value) {
+            revert SafeCastOverflowedIntDowncast(240, value);
+        }
+    }
+
+    /**
+     * @dev Returns the downcasted int232 from int256, reverting on
+     * overflow (when the input is less than smallest int232 or
+     * greater than largest int232).
+     *
+     * Counterpart to Solidity's `int232` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 232 bits
+     */
+    function toInt232(int256 value) internal pure returns (int232 downcasted) {
+        downcasted = int232(value);
+        if (downcasted != value) {
+            revert SafeCastOverflowedIntDowncast(232, value);
+        }
+    }
+
+    /**
+     * @dev Returns the downcasted int224 from int256, reverting on
+     * overflow (when the input is less than smallest int224 or
+     * greater than largest int224).
+     *
+     * Counterpart to Solidity's `int224` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 224 bits
+     */
+    function toInt224(int256 value) internal pure returns (int224 downcasted) {
+        downcasted = int224(value);
+        if (downcasted != value) {
+            revert SafeCastOverflowedIntDowncast(224, value);
+        }
+    }
+
+    /**
+     * @dev Returns the downcasted int216 from int256, reverting on
+     * overflow (when the input is less than smallest int216 or
+     * greater than largest int216).
+     *
+     * Counterpart to Solidity's `int216` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 216 bits
+     */
+    function toInt216(int256 value) internal pure returns (int216 downcasted) {
+        downcasted = int216(value);
+        if (downcasted != value) {
+            revert SafeCastOverflowedIntDowncast(216, value);
+        }
+    }
+
+    /**
+     * @dev Returns the downcasted int208 from int256, reverting on
+     * overflow (when the input is less than smallest int208 or
+     * greater than largest int208).
+     *
+     * Counterpart to Solidity's `int208` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 208 bits
+     */
+    function toInt208(int256 value) internal pure returns (int208 downcasted) {
+        downcasted = int208(value);
+        if (downcasted != value) {
+            revert SafeCastOverflowedIntDowncast(208, value);
+        }
+    }
+
+    /**
+     * @dev Returns the downcasted int200 from int256, reverting on
+     * overflow (when the input is less than smallest int200 or
+     * greater than largest int200).
+     *
+     * Counterpart to Solidity's `int200` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 200 bits
+     */
+    function toInt200(int256 value) internal pure returns (int200 downcasted) {
+        downcasted = int200(value);
+        if (downcasted != value) {
+            revert SafeCastOverflowedIntDowncast(200, value);
+        }
+    }
+
+    /**
+     * @dev Returns the downcasted int192 from int256, reverting on
+     * overflow (when the input is less than smallest int192 or
+     * greater than largest int192).
+     *
+     * Counterpart to Solidity's `int192` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 192 bits
+     */
+    function toInt192(int256 value) internal pure returns (int192 downcasted) {
+        downcasted = int192(value);
+        if (downcasted != value) {
+            revert SafeCastOverflowedIntDowncast(192, value);
+        }
+    }
+
+    /**
+     * @dev Returns the downcasted int184 from int256, reverting on
+     * overflow (when the input is less than smallest int184 or
+     * greater than largest int184).
+     *
+     * Counterpart to Solidity's `int184` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 184 bits
+     */
+    function toInt184(int256 value) internal pure returns (int184 downcasted) {
+        downcasted = int184(value);
+        if (downcasted != value) {
+            revert SafeCastOverflowedIntDowncast(184, value);
+        }
+    }
+
+    /**
+     * @dev Returns the downcasted int176 from int256, reverting on
+     * overflow (when the input is less than smallest int176 or
+     * greater than largest int176).
+     *
+     * Counterpart to Solidity's `int176` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 176 bits
+     */
+    function toInt176(int256 value) internal pure returns (int176 downcasted) {
+        downcasted = int176(value);
+        if (downcasted != value) {
+            revert SafeCastOverflowedIntDowncast(176, value);
+        }
+    }
+
+    /**
+     * @dev Returns the downcasted int168 from int256, reverting on
+     * overflow (when the input is less than smallest int168 or
+     * greater than largest int168).
+     *
+     * Counterpart to Solidity's `int168` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 168 bits
+     */
+    function toInt168(int256 value) internal pure returns (int168 downcasted) {
+        downcasted = int168(value);
+        if (downcasted != value) {
+            revert SafeCastOverflowedIntDowncast(168, value);
+        }
+    }
+
+    /**
+     * @dev Returns the downcasted int160 from int256, reverting on
+     * overflow (when the input is less than smallest int160 or
+     * greater than largest int160).
+     *
+     * Counterpart to Solidity's `int160` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 160 bits
+     */
+    function toInt160(int256 value) internal pure returns (int160 downcasted) {
+        downcasted = int160(value);
+        if (downcasted != value) {
+            revert SafeCastOverflowedIntDowncast(160, value);
+        }
+    }
+
+    /**
+     * @dev Returns the downcasted int152 from int256, reverting on
+     * overflow (when the input is less than smallest int152 or
+     * greater than largest int152).
+     *
+     * Counterpart to Solidity's `int152` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 152 bits
+     */
+    function toInt152(int256 value) internal pure returns (int152 downcasted) {
+        downcasted = int152(value);
+        if (downcasted != value) {
+            revert SafeCastOverflowedIntDowncast(152, value);
+        }
+    }
+
+    /**
+     * @dev Returns the downcasted int144 from int256, reverting on
+     * overflow (when the input is less than smallest int144 or
+     * greater than largest int144).
+     *
+     * Counterpart to Solidity's `int144` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 144 bits
+     */
+    function toInt144(int256 value) internal pure returns (int144 downcasted) {
+        downcasted = int144(value);
+        if (downcasted != value) {
+            revert SafeCastOverflowedIntDowncast(144, value);
+        }
+    }
+
+    /**
+     * @dev Returns the downcasted int136 from int256, reverting on
+     * overflow (when the input is less than smallest int136 or
+     * greater than largest int136).
+     *
+     * Counterpart to Solidity's `int136` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 136 bits
+     */
+    function toInt136(int256 value) internal pure returns (int136 downcasted) {
+        downcasted = int136(value);
+        if (downcasted != value) {
+            revert SafeCastOverflowedIntDowncast(136, value);
+        }
+    }
+
+    /**
+     * @dev Returns the downcasted int128 from int256, reverting on
+     * overflow (when the input is less than smallest int128 or
+     * greater than largest int128).
+     *
+     * Counterpart to Solidity's `int128` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 128 bits
+     */
+    function toInt128(int256 value) internal pure returns (int128 downcasted) {
+        downcasted = int128(value);
+        if (downcasted != value) {
+            revert SafeCastOverflowedIntDowncast(128, value);
+        }
+    }
+
+    /**
+     * @dev Returns the downcasted int120 from int256, reverting on
+     * overflow (when the input is less than smallest int120 or
+     * greater than largest int120).
+     *
+     * Counterpart to Solidity's `int120` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 120 bits
+     */
+    function toInt120(int256 value) internal pure returns (int120 downcasted) {
+        downcasted = int120(value);
+        if (downcasted != value) {
+            revert SafeCastOverflowedIntDowncast(120, value);
+        }
+    }
+
+    /**
+     * @dev Returns the downcasted int112 from int256, reverting on
+     * overflow (when the input is less than smallest int112 or
+     * greater than largest int112).
+     *
+     * Counterpart to Solidity's `int112` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 112 bits
+     */
+    function toInt112(int256 value) internal pure returns (int112 downcasted) {
+        downcasted = int112(value);
+        if (downcasted != value) {
+            revert SafeCastOverflowedIntDowncast(112, value);
+        }
+    }
+
+    /**
+     * @dev Returns the downcasted int104 from int256, reverting on
+     * overflow (when the input is less than smallest int104 or
+     * greater than largest int104).
+     *
+     * Counterpart to Solidity's `int104` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 104 bits
+     */
+    function toInt104(int256 value) internal pure returns (int104 downcasted) {
+        downcasted = int104(value);
+        if (downcasted != value) {
+            revert SafeCastOverflowedIntDowncast(104, value);
+        }
+    }
+
+    /**
+     * @dev Returns the downcasted int96 from int256, reverting on
+     * overflow (when the input is less than smallest int96 or
+     * greater than largest int96).
+     *
+     * Counterpart to Solidity's `int96` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 96 bits
+     */
+    function toInt96(int256 value) internal pure returns (int96 downcasted) {
+        downcasted = int96(value);
+        if (downcasted != value) {
+            revert SafeCastOverflowedIntDowncast(96, value);
+        }
+    }
+
+    /**
+     * @dev Returns the downcasted int88 from int256, reverting on
+     * overflow (when the input is less than smallest int88 or
+     * greater than largest int88).
+     *
+     * Counterpart to Solidity's `int88` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 88 bits
+     */
+    function toInt88(int256 value) internal pure returns (int88 downcasted) {
+        downcasted = int88(value);
+        if (downcasted != value) {
+            revert SafeCastOverflowedIntDowncast(88, value);
+        }
+    }
+
+    /**
+     * @dev Returns the downcasted int80 from int256, reverting on
+     * overflow (when the input is less than smallest int80 or
+     * greater than largest int80).
+     *
+     * Counterpart to Solidity's `int80` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 80 bits
+     */
+    function toInt80(int256 value) internal pure returns (int80 downcasted) {
+        downcasted = int80(value);
+        if (downcasted != value) {
+            revert SafeCastOverflowedIntDowncast(80, value);
+        }
+    }
+
+    /**
+     * @dev Returns the downcasted int72 from int256, reverting on
+     * overflow (when the input is less than smallest int72 or
+     * greater than largest int72).
+     *
+     * Counterpart to Solidity's `int72` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 72 bits
+     */
+    function toInt72(int256 value) internal pure returns (int72 downcasted) {
+        downcasted = int72(value);
+        if (downcasted != value) {
+            revert SafeCastOverflowedIntDowncast(72, value);
+        }
+    }
+
+    /**
+     * @dev Returns the downcasted int64 from int256, reverting on
+     * overflow (when the input is less than smallest int64 or
+     * greater than largest int64).
+     *
+     * Counterpart to Solidity's `int64` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 64 bits
+     */
+    function toInt64(int256 value) internal pure returns (int64 downcasted) {
+        downcasted = int64(value);
+        if (downcasted != value) {
+            revert SafeCastOverflowedIntDowncast(64, value);
+        }
+    }
+
+    /**
+     * @dev Returns the downcasted int56 from int256, reverting on
+     * overflow (when the input is less than smallest int56 or
+     * greater than largest int56).
+     *
+     * Counterpart to Solidity's `int56` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 56 bits
+     */
+    function toInt56(int256 value) internal pure returns (int56 downcasted) {
+        downcasted = int56(value);
+        if (downcasted != value) {
+            revert SafeCastOverflowedIntDowncast(56, value);
+        }
+    }
+
+    /**
+     * @dev Returns the downcasted int48 from int256, reverting on
+     * overflow (when the input is less than smallest int48 or
+     * greater than largest int48).
+     *
+     * Counterpart to Solidity's `int48` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 48 bits
+     */
+    function toInt48(int256 value) internal pure returns (int48 downcasted) {
+        downcasted = int48(value);
+        if (downcasted != value) {
+            revert SafeCastOverflowedIntDowncast(48, value);
+        }
+    }
+
+    /**
+     * @dev Returns the downcasted int40 from int256, reverting on
+     * overflow (when the input is less than smallest int40 or
+     * greater than largest int40).
+     *
+     * Counterpart to Solidity's `int40` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 40 bits
+     */
+    function toInt40(int256 value) internal pure returns (int40 downcasted) {
+        downcasted = int40(value);
+        if (downcasted != value) {
+            revert SafeCastOverflowedIntDowncast(40, value);
+        }
+    }
+
+    /**
+     * @dev Returns the downcasted int32 from int256, reverting on
+     * overflow (when the input is less than smallest int32 or
+     * greater than largest int32).
+     *
+     * Counterpart to Solidity's `int32` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 32 bits
+     */
+    function toInt32(int256 value) internal pure returns (int32 downcasted) {
+        downcasted = int32(value);
+        if (downcasted != value) {
+            revert SafeCastOverflowedIntDowncast(32, value);
+        }
+    }
+
+    /**
+     * @dev Returns the downcasted int24 from int256, reverting on
+     * overflow (when the input is less than smallest int24 or
+     * greater than largest int24).
+     *
+     * Counterpart to Solidity's `int24` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 24 bits
+     */
+    function toInt24(int256 value) internal pure returns (int24 downcasted) {
+        downcasted = int24(value);
+        if (downcasted != value) {
+            revert SafeCastOverflowedIntDowncast(24, value);
+        }
+    }
+
+    /**
+     * @dev Returns the downcasted int16 from int256, reverting on
+     * overflow (when the input is less than smallest int16 or
+     * greater than largest int16).
+     *
+     * Counterpart to Solidity's `int16` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 16 bits
+     */
+    function toInt16(int256 value) internal pure returns (int16 downcasted) {
+        downcasted = int16(value);
+        if (downcasted != value) {
+            revert SafeCastOverflowedIntDowncast(16, value);
+        }
+    }
+
+    /**
+     * @dev Returns the downcasted int8 from int256, reverting on
+     * overflow (when the input is less than smallest int8 or
+     * greater than largest int8).
+     *
+     * Counterpart to Solidity's `int8` operator.
+     *
+     * Requirements:
+     *
+     * - input must fit into 8 bits
+     */
+    function toInt8(int256 value) internal pure returns (int8 downcasted) {
+        downcasted = int8(value);
+        if (downcasted != value) {
+            revert SafeCastOverflowedIntDowncast(8, value);
+        }
+    }
+
+    /**
+     * @dev Converts an unsigned uint256 into a signed int256.
+     *
+     * Requirements:
+     *
+     * - input must be less than or equal to maxInt256.
+     */
+    function toInt256(uint256 value) internal pure returns (int256) {
+        // Note: Unsafe cast below is okay because `type(int256).max` is guaranteed to be positive
+        if (value > uint256(type(int256).max)) {
+            revert SafeCastOverflowedUintToInt(value);
+        }
+        return int256(value);
+    }
+
+    /**
+     * @dev Cast a boolean (false or true) to a uint256 (0 or 1) with no jump.
+     */
+    function toUint(bool b) internal pure returns (uint256 u) {
+        assembly ("memory-safe") {
+            u := iszero(iszero(b))
+        }
+    }
+}

third_party/real_code/rc17/sources/@openzeppelin/contracts/utils/math/SignedMath.sol

@@ -0,0 +1,68 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.1.0) (utils/math/SignedMath.sol)
+
+pragma solidity ^0.8.20;
+
+import {SafeCast} from "./SafeCast.sol";
+
+/**
+ * @dev Standard signed math utilities missing in the Solidity language.
+ */
+library SignedMath {
+    /**
+     * @dev Branchless ternary evaluation for `a ? b : c`. Gas costs are constant.
+     *
+     * IMPORTANT: This function may reduce bytecode size and consume less gas when used standalone.
+     * However, the compiler may optimize Solidity ternary operations (i.e. `a ? b : c`) to only compute
+     * one branch when needed, making this function more expensive.
+     */
+    function ternary(bool condition, int256 a, int256 b) internal pure returns (int256) {
+        unchecked {
+            // branchless ternary works because:
+            // b ^ (a ^ b) == a
+            // b ^ 0 == b
+            return b ^ ((a ^ b) * int256(SafeCast.toUint(condition)));
+        }
+    }
+
+    /**
+     * @dev Returns the largest of two signed numbers.
+     */
+    function max(int256 a, int256 b) internal pure returns (int256) {
+        return ternary(a > b, a, b);
+    }
+
+    /**
+     * @dev Returns the smallest of two signed numbers.
+     */
+    function min(int256 a, int256 b) internal pure returns (int256) {
+        return ternary(a < b, a, b);
+    }
+
+    /**
+     * @dev Returns the average of two signed numbers without overflow.
+     * The result is rounded towards zero.
+     */
+    function average(int256 a, int256 b) internal pure returns (int256) {
+        // Formula from the book "Hacker's Delight"
+        int256 x = (a & b) + ((a ^ b) >> 1);
+        return x + (int256(uint256(x) >> 255) & (a ^ b));
+    }
+
+    /**
+     * @dev Returns the absolute unsigned value of a signed value.
+     */
+    function abs(int256 n) internal pure returns (uint256) {
+        unchecked {
+            // Formula from the "Bit Twiddling Hacks" by Sean Eron Anderson.
+            // Since `n` is a signed integer, the generated bytecode will use the SAR opcode to perform the right shift,
+            // taking advantage of the most significant (or "sign" bit) in two's complement representation.
+            // This opcode adds new most significant bits set to the value of the previous most significant bit. As a result,
+            // the mask will either be `bytes32(0)` (if n is positive) or `~bytes32(0)` (if n is negative).
+            int256 mask = n >> 255;
+
+            // A `bytes32(0)` mask leaves the input unchanged, while a `~bytes32(0)` mask complements it.
+            return uint256((n + mask) ^ mask);
+        }
+    }
+}

third_party/real_code/rc17/sources/contracts/SharpNFT.sol

@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: MIT
+// Compatible with OpenZeppelin Contracts ^5.0.0
+pragma solidity ^0.8.22;
+
+import {ERC721} from "@openzeppelin/contracts/token/ERC721/ERC721.sol";
+import {ERC721Enumerable} from "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
+import {ERC721URIStorage} from "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
+import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
+
+contract SharpNFT is ERC721, ERC721Enumerable, ERC721URIStorage, Ownable {
+    uint256 private _nextTokenId;
+    event Locked(uint256 tokenId);
+    constructor( address initialOwner) ERC721("SharpNFT", "SNFT") Ownable(initialOwner) {}
+
+    function safeMint(address to, string memory uri) public onlyOwner returns (uint256) {
+        uint256 tokenId = _nextTokenId++;
+        _safeMint(to, tokenId);
+        _setTokenURI(tokenId, uri);
+        emit Locked(tokenId);
+        return tokenId;
+    }
+
+    // The following functions are overrides required by Solidity.
+
+    function _update(address to, uint256 tokenId, address auth) internal override(ERC721, ERC721Enumerable) returns (address) {
+        return super._update(to, tokenId, auth);
+    }
+
+    function _increaseBalance(address account, uint128 value) internal override(ERC721, ERC721Enumerable) {
+        super._increaseBalance(account, value);
+    }
+
+    function tokenURI(uint256 tokenId) public view override(ERC721, ERC721URIStorage) returns (string memory) {
+        return super.tokenURI(tokenId);
+    }
+
+    function supportsInterface(bytes4 interfaceId) public view override(ERC721, ERC721Enumerable, ERC721URIStorage) returns (bool)
+    {
+        return super.supportsInterface(interfaceId);
+    }
+}

third_party/real_code/rc18/NOTICE

@@ -0,0 +1,44 @@
+# Notice for rc18
+
+This package contains smart contract source files verified on Sourcify.
+
+## Source Files and Licensing
+
+- File: `@openzeppelin/contracts/access/Ownable.sol`
+  SPDX: MIT
+
+- File: `@openzeppelin/contracts/security/ReentrancyGuard.sol`
+  SPDX: MIT
+
+- File: `@openzeppelin/contracts/token/ERC721/IERC721.sol`
+  SPDX: MIT
+
+- File: `@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol`
+  SPDX: MIT
+
+- File: `@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol`
+  SPDX: MIT
+
+- File: `@openzeppelin/contracts/utils/Address.sol`
+  SPDX: MIT
+
+- File: `@openzeppelin/contracts/utils/Context.sol`
+  SPDX: MIT
+
+- File: `@openzeppelin/contracts/utils/Strings.sol`
+  SPDX: MIT
+
+- File: `@openzeppelin/contracts/utils/cryptography/MerkleProof.sol`
+  SPDX: MIT
+
+- File: `@openzeppelin/contracts/utils/introspection/ERC165.sol`
+  SPDX: MIT
+
+- File: `@openzeppelin/contracts/utils/introspection/IERC165.sol`
+  SPDX: MIT
+
+- File: `contracts/PerkyPigs.sol`
+  SPDX: MIT
+
+- File: `erc721a/contracts/ERC721A.sol`
+  SPDX: MIT

third_party/real_code/rc18/abi.json

@@ -0,0 +1,834 @@
+[
+  {
+    "type": "constructor",
+    "inputs": [
+      {
+        "name": "_tokenName",
+        "type": "string",
+        "internalType": "string"
+      },
+      {
+        "name": "_tokenSymbol",
+        "type": "string",
+        "internalType": "string"
+      },
+      {
+        "name": "_cost",
+        "type": "uint256",
+        "internalType": "uint256"
+      },
+      {
+        "name": "_maxSupply",
+        "type": "uint256",
+        "internalType": "uint256"
+      },
+      {
+        "name": "_maxMintAmountPerTx",
+        "type": "uint256",
+        "internalType": "uint256"
+      },
+      {
+        "name": "_hiddenMetadataUri",
+        "type": "string",
+        "internalType": "string"
+      }
+    ],
+    "stateMutability": "nonpayable"
+  },
+  {
+    "name": "ApprovalCallerNotOwnerNorApproved",
+    "type": "error",
+    "inputs": []
+  },
+  {
+    "name": "ApprovalQueryForNonexistentToken",
+    "type": "error",
+    "inputs": []
+  },
+  {
+    "name": "ApprovalToCurrentOwner",
+    "type": "error",
+    "inputs": []
+  },
+  {
+    "name": "ApproveToCaller",
+    "type": "error",
+    "inputs": []
+  },
+  {
+    "name": "BalanceQueryForZeroAddress",
+    "type": "error",
+    "inputs": []
+  },
+  {
+    "name": "MintToZeroAddress",
+    "type": "error",
+    "inputs": []
+  },
+  {
+    "name": "MintZeroQuantity",
+    "type": "error",
+    "inputs": []
+  },
+  {
+    "name": "OwnerQueryForNonexistentToken",
+    "type": "error",
+    "inputs": []
+  },
+  {
+    "name": "TransferCallerNotOwnerNorApproved",
+    "type": "error",
+    "inputs": []
+  },
+  {
+    "name": "TransferFromIncorrectOwner",
+    "type": "error",
+    "inputs": []
+  },
+  {
+    "name": "TransferToNonERC721ReceiverImplementer",
+    "type": "error",
+    "inputs": []
+  },
+  {
+    "name": "TransferToZeroAddress",
+    "type": "error",
+    "inputs": []
+  },
+  {
+    "name": "Approval",
+    "type": "event",
+    "inputs": [
+      {
+        "name": "owner",
+        "type": "address",
+        "indexed": true,
+        "internalType": "address"
+      },
+      {
+        "name": "approved",
+        "type": "address",
+        "indexed": true,
+        "internalType": "address"
+      },
+      {
+        "name": "tokenId",
+        "type": "uint256",
+        "indexed": true,
+        "internalType": "uint256"
+      }
+    ],
+    "anonymous": false
+  },
+  {
+    "name": "ApprovalForAll",
+    "type": "event",
+    "inputs": [
+      {
+        "name": "owner",
+        "type": "address",
+        "indexed": true,
+        "internalType": "address"
+      },
+      {
+        "name": "operator",
+        "type": "address",
+        "indexed": true,
+        "internalType": "address"
+      },
+      {
+        "name": "approved",
+        "type": "bool",
+        "indexed": false,
+        "internalType": "bool"
+      }
+    ],
+    "anonymous": false
+  },
+  {
+    "name": "OwnershipTransferred",
+    "type": "event",
+    "inputs": [
+      {
+        "name": "previousOwner",
+        "type": "address",
+        "indexed": true,
+        "internalType": "address"
+      },
+      {
+        "name": "newOwner",
+        "type": "address",
+        "indexed": true,
+        "internalType": "address"
+      }
+    ],
+    "anonymous": false
+  },
+  {
+    "name": "Transfer",
+    "type": "event",
+    "inputs": [
+      {
+        "name": "from",
+        "type": "address",
+        "indexed": true,
+        "internalType": "address"
+      },
+      {
+        "name": "to",
+        "type": "address",
+        "indexed": true,
+        "internalType": "address"
+      },
+      {
+        "name": "tokenId",
+        "type": "uint256",
+        "indexed": true,
+        "internalType": "uint256"
+      }
+    ],
+    "anonymous": false
+  },
+  {
+    "name": "approve",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "to",
+        "type": "address",
+        "internalType": "address"
+      },
+      {
+        "name": "tokenId",
+        "type": "uint256",
+        "internalType": "uint256"
+      }
+    ],
+    "outputs": [],
+    "stateMutability": "nonpayable"
+  },
+  {
+    "name": "balanceOf",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "owner",
+        "type": "address",
+        "internalType": "address"
+      }
+    ],
+    "outputs": [
+      {
+        "name": "",
+        "type": "uint256",
+        "internalType": "uint256"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "cost",
+    "type": "function",
+    "inputs": [],
+    "outputs": [
+      {
+        "name": "",
+        "type": "uint256",
+        "internalType": "uint256"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "getApproved",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "tokenId",
+        "type": "uint256",
+        "internalType": "uint256"
+      }
+    ],
+    "outputs": [
+      {
+        "name": "",
+        "type": "address",
+        "internalType": "address"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "hiddenMetadataUri",
+    "type": "function",
+    "inputs": [],
+    "outputs": [
+      {
+        "name": "",
+        "type": "string",
+        "internalType": "string"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "isApprovedForAll",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "owner",
+        "type": "address",
+        "internalType": "address"
+      },
+      {
+        "name": "operator",
+        "type": "address",
+        "internalType": "address"
+      }
+    ],
+    "outputs": [
+      {
+        "name": "",
+        "type": "bool",
+        "internalType": "bool"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "maxMintAmountPerTx",
+    "type": "function",
+    "inputs": [],
+    "outputs": [
+      {
+        "name": "",
+        "type": "uint256",
+        "internalType": "uint256"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "maxSupply",
+    "type": "function",
+    "inputs": [],
+    "outputs": [
+      {
+        "name": "",
+        "type": "uint256",
+        "internalType": "uint256"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "merkleRoot",
+    "type": "function",
+    "inputs": [],
+    "outputs": [
+      {
+        "name": "",
+        "type": "bytes32",
+        "internalType": "bytes32"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "mint",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "_mintAmount",
+        "type": "uint256",
+        "internalType": "uint256"
+      }
+    ],
+    "outputs": [],
+    "stateMutability": "payable"
+  },
+  {
+    "name": "mintForAddress",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "_mintAmount",
+        "type": "uint256",
+        "internalType": "uint256"
+      },
+      {
+        "name": "_receiver",
+        "type": "address",
+        "internalType": "address"
+      }
+    ],
+    "outputs": [],
+    "stateMutability": "nonpayable"
+  },
+  {
+    "name": "name",
+    "type": "function",
+    "inputs": [],
+    "outputs": [
+      {
+        "name": "",
+        "type": "string",
+        "internalType": "string"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "owner",
+    "type": "function",
+    "inputs": [],
+    "outputs": [
+      {
+        "name": "",
+        "type": "address",
+        "internalType": "address"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "ownerOf",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "tokenId",
+        "type": "uint256",
+        "internalType": "uint256"
+      }
+    ],
+    "outputs": [
+      {
+        "name": "",
+        "type": "address",
+        "internalType": "address"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "paused",
+    "type": "function",
+    "inputs": [],
+    "outputs": [
+      {
+        "name": "",
+        "type": "bool",
+        "internalType": "bool"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "renounceOwnership",
+    "type": "function",
+    "inputs": [],
+    "outputs": [],
+    "stateMutability": "nonpayable"
+  },
+  {
+    "name": "revealed",
+    "type": "function",
+    "inputs": [],
+    "outputs": [
+      {
+        "name": "",
+        "type": "bool",
+        "internalType": "bool"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "safeTransferFrom",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "from",
+        "type": "address",
+        "internalType": "address"
+      },
+      {
+        "name": "to",
+        "type": "address",
+        "internalType": "address"
+      },
+      {
+        "name": "tokenId",
+        "type": "uint256",
+        "internalType": "uint256"
+      }
+    ],
+    "outputs": [],
+    "stateMutability": "nonpayable"
+  },
+  {
+    "name": "safeTransferFrom",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "from",
+        "type": "address",
+        "internalType": "address"
+      },
+      {
+        "name": "to",
+        "type": "address",
+        "internalType": "address"
+      },
+      {
+        "name": "tokenId",
+        "type": "uint256",
+        "internalType": "uint256"
+      },
+      {
+        "name": "_data",
+        "type": "bytes",
+        "internalType": "bytes"
+      }
+    ],
+    "outputs": [],
+    "stateMutability": "nonpayable"
+  },
+  {
+    "name": "setApprovalForAll",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "operator",
+        "type": "address",
+        "internalType": "address"
+      },
+      {
+        "name": "approved",
+        "type": "bool",
+        "internalType": "bool"
+      }
+    ],
+    "outputs": [],
+    "stateMutability": "nonpayable"
+  },
+  {
+    "name": "setCost",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "_cost",
+        "type": "uint256",
+        "internalType": "uint256"
+      }
+    ],
+    "outputs": [],
+    "stateMutability": "nonpayable"
+  },
+  {
+    "name": "setHiddenMetadataUri",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "_hiddenMetadataUri",
+        "type": "string",
+        "internalType": "string"
+      }
+    ],
+    "outputs": [],
+    "stateMutability": "nonpayable"
+  },
+  {
+    "name": "setMaxMintAmountPerTx",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "_maxMintAmountPerTx",
+        "type": "uint256",
+        "internalType": "uint256"
+      }
+    ],
+    "outputs": [],
+    "stateMutability": "nonpayable"
+  },
+  {
+    "name": "setMerkleRoot",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "_merkleRoot",
+        "type": "bytes32",
+        "internalType": "bytes32"
+      }
+    ],
+    "outputs": [],
+    "stateMutability": "nonpayable"
+  },
+  {
+    "name": "setPaused",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "_state",
+        "type": "bool",
+        "internalType": "bool"
+      }
+    ],
+    "outputs": [],
+    "stateMutability": "nonpayable"
+  },
+  {
+    "name": "setRevealed",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "_state",
+        "type": "bool",
+        "internalType": "bool"
+      }
+    ],
+    "outputs": [],
+    "stateMutability": "nonpayable"
+  },
+  {
+    "name": "setUriPrefix",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "_uriPrefix",
+        "type": "string",
+        "internalType": "string"
+      }
+    ],
+    "outputs": [],
+    "stateMutability": "nonpayable"
+  },
+  {
+    "name": "setUriSuffix",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "_uriSuffix",
+        "type": "string",
+        "internalType": "string"
+      }
+    ],
+    "outputs": [],
+    "stateMutability": "nonpayable"
+  },
+  {
+    "name": "setWhitelistMintEnabled",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "_state",
+        "type": "bool",
+        "internalType": "bool"
+      }
+    ],
+    "outputs": [],
+    "stateMutability": "nonpayable"
+  },
+  {
+    "name": "supportsInterface",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "interfaceId",
+        "type": "bytes4",
+        "internalType": "bytes4"
+      }
+    ],
+    "outputs": [
+      {
+        "name": "",
+        "type": "bool",
+        "internalType": "bool"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "symbol",
+    "type": "function",
+    "inputs": [],
+    "outputs": [
+      {
+        "name": "",
+        "type": "string",
+        "internalType": "string"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "tokenURI",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "_tokenId",
+        "type": "uint256",
+        "internalType": "uint256"
+      }
+    ],
+    "outputs": [
+      {
+        "name": "",
+        "type": "string",
+        "internalType": "string"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "totalSupply",
+    "type": "function",
+    "inputs": [],
+    "outputs": [
+      {
+        "name": "",
+        "type": "uint256",
+        "internalType": "uint256"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "transferFrom",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "from",
+        "type": "address",
+        "internalType": "address"
+      },
+      {
+        "name": "to",
+        "type": "address",
+        "internalType": "address"
+      },
+      {
+        "name": "tokenId",
+        "type": "uint256",
+        "internalType": "uint256"
+      }
+    ],
+    "outputs": [],
+    "stateMutability": "nonpayable"
+  },
+  {
+    "name": "transferOwnership",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "newOwner",
+        "type": "address",
+        "internalType": "address"
+      }
+    ],
+    "outputs": [],
+    "stateMutability": "nonpayable"
+  },
+  {
+    "name": "uriPrefix",
+    "type": "function",
+    "inputs": [],
+    "outputs": [
+      {
+        "name": "",
+        "type": "string",
+        "internalType": "string"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "uriSuffix",
+    "type": "function",
+    "inputs": [],
+    "outputs": [
+      {
+        "name": "",
+        "type": "string",
+        "internalType": "string"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "walletOfOwner",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "_owner",
+        "type": "address",
+        "internalType": "address"
+      }
+    ],
+    "outputs": [
+      {
+        "name": "",
+        "type": "uint256[]",
+        "internalType": "uint256[]"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "whitelistClaimed",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "",
+        "type": "address",
+        "internalType": "address"
+      }
+    ],
+    "outputs": [
+      {
+        "name": "",
+        "type": "bool",
+        "internalType": "bool"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "whitelistMint",
+    "type": "function",
+    "inputs": [
+      {
+        "name": "_mintAmount",
+        "type": "uint256",
+        "internalType": "uint256"
+      },
+      {
+        "name": "_merkleProof",
+        "type": "bytes32[]",
+        "internalType": "bytes32[]"
+      }
+    ],
+    "outputs": [],
+    "stateMutability": "payable"
+  },
+  {
+    "name": "whitelistMintEnabled",
+    "type": "function",
+    "inputs": [],
+    "outputs": [
+      {
+        "name": "",
+        "type": "bool",
+        "internalType": "bool"
+      }
+    ],
+    "stateMutability": "view"
+  },
+  {
+    "name": "withdraw",
+    "type": "function",
+    "inputs": [],
+    "outputs": [],
+    "stateMutability": "nonpayable"
+  }
+]

third_party/real_code/rc18/creation.hex

@@ -0,0 +1 @@
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third_party/real_code/rc18/provenance.json

@@ -0,0 +1,10 @@
+{
+  "id": "rc18",
+  "chain": "polygon",
+  "address": "0x75e9ba1666f5987e46b33709ae81212d10dfbb8e",
+  "is_proxy": false,
+  "implementation": "",
+  "sourcify_match_type": "exact_match",
+  "fetched_utc_time": "2026-06-22T19:02:28Z",
+  "creation_hex_sha256": "82dfcac5e8cce3be6fba1e35d1b88158757c514ca4ec896ed07e0779d8422c04"
+}

third_party/real_code/rc18/recipe.yaml

@@ -0,0 +1,16 @@
+steps:
+- signer: deployer
+  deploy: $target
+  args:
+  - NFT
+  - NFT
+  - 0
+  - 10000
+  - 10000
+  - https://uri/
+- signer: deployer
+  to: $target
+  function: mintForAddress
+  args:
+  - 1
+  - $alice

third_party/real_code/rc18/sources/@openzeppelin/contracts/access/Ownable.sol

@@ -0,0 +1,76 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)
+
+pragma solidity ^0.8.0;
+
+import "../utils/Context.sol";
+
+/**
+ * @dev Contract module which provides a basic access control mechanism, where
+ * there is an account (an owner) that can be granted exclusive access to
+ * specific functions.
+ *
+ * By default, the owner account will be the one that deploys the contract. This
+ * can later be changed with {transferOwnership}.
+ *
+ * This module is used through inheritance. It will make available the modifier
+ * `onlyOwner`, which can be applied to your functions to restrict their use to
+ * the owner.
+ */
+abstract contract Ownable is Context {
+    address private _owner;
+
+    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
+
+    /**
+     * @dev Initializes the contract setting the deployer as the initial owner.
+     */
+    constructor() {
+        _transferOwnership(_msgSender());
+    }
+
+    /**
+     * @dev Returns the address of the current owner.
+     */
+    function owner() public view virtual returns (address) {
+        return _owner;
+    }
+
+    /**
+     * @dev Throws if called by any account other than the owner.
+     */
+    modifier onlyOwner() {
+        require(owner() == _msgSender(), "Ownable: caller is not the owner");
+        _;
+    }
+
+    /**
+     * @dev Leaves the contract without owner. It will not be possible to call
+     * `onlyOwner` functions anymore. Can only be called by the current owner.
+     *
+     * NOTE: Renouncing ownership will leave the contract without an owner,
+     * thereby removing any functionality that is only available to the owner.
+     */
+    function renounceOwnership() public virtual onlyOwner {
+        _transferOwnership(address(0));
+    }
+
+    /**
+     * @dev Transfers ownership of the contract to a new account (`newOwner`).
+     * Can only be called by the current owner.
+     */
+    function transferOwnership(address newOwner) public virtual onlyOwner {
+        require(newOwner != address(0), "Ownable: new owner is the zero address");
+        _transferOwnership(newOwner);
+    }
+
+    /**
+     * @dev Transfers ownership of the contract to a new account (`newOwner`).
+     * Internal function without access restriction.
+     */
+    function _transferOwnership(address newOwner) internal virtual {
+        address oldOwner = _owner;
+        _owner = newOwner;
+        emit OwnershipTransferred(oldOwner, newOwner);
+    }
+}

third_party/real_code/rc18/sources/@openzeppelin/contracts/security/ReentrancyGuard.sol

@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)
+
+pragma solidity ^0.8.0;
+
+/**
+ * @dev Contract module that helps prevent reentrant calls to a function.
+ *
+ * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
+ * available, which can be applied to functions to make sure there are no nested
+ * (reentrant) calls to them.
+ *
+ * Note that because there is a single `nonReentrant` guard, functions marked as
+ * `nonReentrant` may not call one another. This can be worked around by making
+ * those functions `private`, and then adding `external` `nonReentrant` entry
+ * points to them.
+ *
+ * TIP: If you would like to learn more about reentrancy and alternative ways
+ * to protect against it, check out our blog post
+ * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
+ */
+abstract contract ReentrancyGuard {
+    // Booleans are more expensive than uint256 or any type that takes up a full
+    // word because each write operation emits an extra SLOAD to first read the
+    // slot's contents, replace the bits taken up by the boolean, and then write
+    // back. This is the compiler's defense against contract upgrades and
+    // pointer aliasing, and it cannot be disabled.
+
+    // The values being non-zero value makes deployment a bit more expensive,
+    // but in exchange the refund on every call to nonReentrant will be lower in
+    // amount. Since refunds are capped to a percentage of the total
+    // transaction's gas, it is best to keep them low in cases like this one, to
+    // increase the likelihood of the full refund coming into effect.
+    uint256 private constant _NOT_ENTERED = 1;
+    uint256 private constant _ENTERED = 2;
+
+    uint256 private _status;
+
+    constructor() {
+        _status = _NOT_ENTERED;
+    }
+
+    /**
+     * @dev Prevents a contract from calling itself, directly or indirectly.
+     * Calling a `nonReentrant` function from another `nonReentrant`
+     * function is not supported. It is possible to prevent this from happening
+     * by making the `nonReentrant` function external, and making it call a
+     * `private` function that does the actual work.
+     */
+    modifier nonReentrant() {
+        // On the first call to nonReentrant, _notEntered will be true
+        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
+
+        // Any calls to nonReentrant after this point will fail
+        _status = _ENTERED;
+
+        _;
+
+        // By storing the original value once again, a refund is triggered (see
+        // https://eips.ethereum.org/EIPS/eip-2200)
+        _status = _NOT_ENTERED;
+    }
+}

third_party/real_code/rc18/sources/@openzeppelin/contracts/token/ERC721/IERC721.sol

@@ -0,0 +1,143 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)
+
+pragma solidity ^0.8.0;
+
+import "../../utils/introspection/IERC165.sol";
+
+/**
+ * @dev Required interface of an ERC721 compliant contract.
+ */
+interface IERC721 is IERC165 {
+    /**
+     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
+     */
+    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
+
+    /**
+     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
+     */
+    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
+
+    /**
+     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
+     */
+    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
+
+    /**
+     * @dev Returns the number of tokens in ``owner``'s account.
+     */
+    function balanceOf(address owner) external view returns (uint256 balance);
+
+    /**
+     * @dev Returns the owner of the `tokenId` token.
+     *
+     * Requirements:
+     *
+     * - `tokenId` must exist.
+     */
+    function ownerOf(uint256 tokenId) external view returns (address owner);
+
+    /**
+     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
+     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
+     *
+     * Requirements:
+     *
+     * - `from` cannot be the zero address.
+     * - `to` cannot be the zero address.
+     * - `tokenId` token must exist and be owned by `from`.
+     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
+     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
+     *
+     * Emits a {Transfer} event.
+     */
+    function safeTransferFrom(
+        address from,
+        address to,
+        uint256 tokenId
+    ) external;
+
+    /**
+     * @dev Transfers `tokenId` token from `from` to `to`.
+     *
+     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
+     *
+     * Requirements:
+     *
+     * - `from` cannot be the zero address.
+     * - `to` cannot be the zero address.
+     * - `tokenId` token must be owned by `from`.
+     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
+     *
+     * Emits a {Transfer} event.
+     */
+    function transferFrom(
+        address from,
+        address to,
+        uint256 tokenId
+    ) external;
+
+    /**
+     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
+     * The approval is cleared when the token is transferred.
+     *
+     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
+     *
+     * Requirements:
+     *
+     * - The caller must own the token or be an approved operator.
+     * - `tokenId` must exist.
+     *
+     * Emits an {Approval} event.
+     */
+    function approve(address to, uint256 tokenId) external;
+
+    /**
+     * @dev Returns the account approved for `tokenId` token.
+     *
+     * Requirements:
+     *
+     * - `tokenId` must exist.
+     */
+    function getApproved(uint256 tokenId) external view returns (address operator);
+
+    /**
+     * @dev Approve or remove `operator` as an operator for the caller.
+     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
+     *
+     * Requirements:
+     *
+     * - The `operator` cannot be the caller.
+     *
+     * Emits an {ApprovalForAll} event.
+     */
+    function setApprovalForAll(address operator, bool _approved) external;
+
+    /**
+     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
+     *
+     * See {setApprovalForAll}
+     */
+    function isApprovedForAll(address owner, address operator) external view returns (bool);
+
+    /**
+     * @dev Safely transfers `tokenId` token from `from` to `to`.
+     *
+     * Requirements:
+     *
+     * - `from` cannot be the zero address.
+     * - `to` cannot be the zero address.
+     * - `tokenId` token must exist and be owned by `from`.
+     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
+     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
+     *
+     * Emits a {Transfer} event.
+     */
+    function safeTransferFrom(
+        address from,
+        address to,
+        uint256 tokenId,
+        bytes calldata data
+    ) external;
+}

third_party/real_code/rc18/sources/@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol

@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol)
+
+pragma solidity ^0.8.0;
+
+/**
+ * @title ERC721 token receiver interface
+ * @dev Interface for any contract that wants to support safeTransfers
+ * from ERC721 asset contracts.
+ */
+interface IERC721Receiver {
+    /**
+     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
+     * by `operator` from `from`, this function is called.
+     *
+     * It must return its Solidity selector to confirm the token transfer.
+     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
+     *
+     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
+     */
+    function onERC721Received(
+        address operator,
+        address from,
+        uint256 tokenId,
+        bytes calldata data
+    ) external returns (bytes4);
+}

third_party/real_code/rc18/sources/@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol

@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)
+
+pragma solidity ^0.8.0;
+
+import "../IERC721.sol";
+
+/**
+ * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
+ * @dev See https://eips.ethereum.org/EIPS/eip-721
+ */
+interface IERC721Metadata is IERC721 {
+    /**
+     * @dev Returns the token collection name.
+     */
+    function name() external view returns (string memory);
+
+    /**
+     * @dev Returns the token collection symbol.
+     */
+    function symbol() external view returns (string memory);
+
+    /**
+     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
+     */
+    function tokenURI(uint256 tokenId) external view returns (string memory);
+}

third_party/real_code/rc18/sources/@openzeppelin/contracts/utils/Address.sol

@@ -0,0 +1,222 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)
+
+pragma solidity ^0.8.1;
+
+/**
+ * @dev Collection of functions related to the address type
+ */
+library Address {
+    /**
+     * @dev Returns true if `account` is a contract.
+     *
+     * [IMPORTANT]
+     * ====
+     * It is unsafe to assume that an address for which this function returns
+     * false is an externally-owned account (EOA) and not a contract.
+     *
+     * Among others, `isContract` will return false for the following
+     * types of addresses:
+     *
+     *  - an externally-owned account
+     *  - a contract in construction
+     *  - an address where a contract will be created
+     *  - an address where a contract lived, but was destroyed
+     * ====
+     *
+     * [IMPORTANT]
+     * ====
+     * You shouldn't rely on `isContract` to protect against flash loan attacks!
+     *
+     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
+     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
+     * constructor.
+     * ====
+     */
+    function isContract(address account) internal view returns (bool) {
+        // This method relies on extcodesize/address.code.length, which returns 0
+        // for contracts in construction, since the code is only stored at the end
+        // of the constructor execution.
+
+        return account.code.length > 0;
+    }
+
+    /**
+     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
+     * `recipient`, forwarding all available gas and reverting on errors.
+     *
+     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
+     * of certain opcodes, possibly making contracts go over the 2300 gas limit
+     * imposed by `transfer`, making them unable to receive funds via
+     * `transfer`. {sendValue} removes this limitation.
+     *
+     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
+     *
+     * IMPORTANT: because control is transferred to `recipient`, care must be
+     * taken to not create reentrancy vulnerabilities. Consider using
+     * {ReentrancyGuard} or the
+     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
+     */
+    function sendValue(address payable recipient, uint256 amount) internal {
+        require(address(this).balance >= amount, "Address: insufficient balance");
+
+        (bool success, ) = recipient.call{value: amount}("");
+        require(success, "Address: unable to send value, recipient may have reverted");
+    }
+
+    /**
+     * @dev Performs a Solidity function call using a low level `call`. A
+     * plain `call` is an unsafe replacement for a function call: use this
+     * function instead.
+     *
+     * If `target` reverts with a revert reason, it is bubbled up by this
+     * function (like regular Solidity function calls).
+     *
+     * Returns the raw returned data. To convert to the expected return value,
+     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
+     *
+     * Requirements:
+     *
+     * - `target` must be a contract.
+     * - calling `target` with `data` must not revert.
+     *
+     * _Available since v3.1._
+     */
+    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
+        return functionCall(target, data, "Address: low-level call failed");
+    }
+
+    /**
+     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
+     * `errorMessage` as a fallback revert reason when `target` reverts.
+     *
+     * _Available since v3.1._
+     */
+    function functionCall(
+        address target,
+        bytes memory data,
+        string memory errorMessage
+    ) internal returns (bytes memory) {
+        return functionCallWithValue(target, data, 0, errorMessage);
+    }
+
+    /**
+     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
+     * but also transferring `value` wei to `target`.
+     *
+     * Requirements:
+     *
+     * - the calling contract must have an ETH balance of at least `value`.
+     * - the called Solidity function must be `payable`.
+     *
+     * _Available since v3.1._
+     */
+    function functionCallWithValue(
+        address target,
+        bytes memory data,
+        uint256 value
+    ) internal returns (bytes memory) {
+        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
+    }
+
+    /**
+     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
+     * with `errorMessage` as a fallback revert reason when `target` reverts.
+     *
+     * _Available since v3.1._
+     */
+    function functionCallWithValue(
+        address target,
+        bytes memory data,
+        uint256 value,
+        string memory errorMessage
+    ) internal returns (bytes memory) {
+        require(address(this).balance >= value, "Address: insufficient balance for call");
+        require(isContract(target), "Address: call to non-contract");
+
+        (bool success, bytes memory returndata) = target.call{value: value}(data);
+        return verifyCallResult(success, returndata, errorMessage);
+    }
+
+    /**
+     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
+     * but performing a static call.
+     *
+     * _Available since v3.3._
+     */
+    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
+        return functionStaticCall(target, data, "Address: low-level static call failed");
+    }
+
+    /**
+     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
+     * but performing a static call.
+     *
+     * _Available since v3.3._
+     */
+    function functionStaticCall(
+        address target,
+        bytes memory data,
+        string memory errorMessage
+    ) internal view returns (bytes memory) {
+        require(isContract(target), "Address: static call to non-contract");
+
+        (bool success, bytes memory returndata) = target.staticcall(data);
+        return verifyCallResult(success, returndata, errorMessage);
+    }
+
+    /**
+     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
+     * but performing a delegate call.
+     *
+     * _Available since v3.4._
+     */
+    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
+        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
+    }
+
+    /**
+     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
+     * but performing a delegate call.
+     *
+     * _Available since v3.4._
+     */
+    function functionDelegateCall(
+        address target,
+        bytes memory data,
+        string memory errorMessage
+    ) internal returns (bytes memory) {
+        require(isContract(target), "Address: delegate call to non-contract");
+
+        (bool success, bytes memory returndata) = target.delegatecall(data);
+        return verifyCallResult(success, returndata, errorMessage);
+    }
+
+    /**
+     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
+     * revert reason using the provided one.
+     *
+     * _Available since v4.3._
+     */
+    function verifyCallResult(
+        bool success,
+        bytes memory returndata,
+        string memory errorMessage
+    ) internal pure returns (bytes memory) {
+        if (success) {
+            return returndata;
+        } else {
+            // Look for revert reason and bubble it up if present
+            if (returndata.length > 0) {
+                // The easiest way to bubble the revert reason is using memory via assembly
+
+                assembly {
+                    let returndata_size := mload(returndata)
+                    revert(add(32, returndata), returndata_size)
+                }
+            } else {
+                revert(errorMessage);
+            }
+        }
+    }
+}