| // SPDX-License-Identifier: MIT | |
| pragma solidity ^0.8.20; | |
| import {ERC721} from "@openzeppelin/contracts/token/ERC721/ERC721.sol"; | |
| contract Collection16 is ERC721 { | |
| address public immutable minter; | |
| constructor(address minter_) ERC721("Collection", "NFT") { | |
| minter = minter_; | |
| } | |
| function mint(address to, uint256 tokenId) external { | |
| require(msg.sender == minter, "only minter"); | |
| _mint(to, tokenId); | |
| } | |
| function exists(uint256 tokenId) external view returns (bool) { | |
| return _ownerOf(tokenId) != address(0); | |
| } | |
| } | |