Create app.py

app.py

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+# debug_which.py
+from mnemonic import Mnemonic
+from eth_account import Account
+from eth_utils import keccak, to_checksum_address
+import coincurve, hmac, hashlib
+
+Account.enable_unaudited_hdwallet_features()
+phrase = "lesson cushion crane affair federal decline limb spend reunion chief cart zebra"
+TARGET = "0x3f0482fc3e9132c3d3acb5f588e980d7b3a5af07"
+
+# --- Manual BIP32 ---
+_N = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141
+_H = 0x80000000
+def _child(priv, chain, i):
+    if i >= _H:
+        data = b'\x00' + priv + i.to_bytes(4, 'big')
+    else:
+        pub = coincurve.PrivateKey(priv).public_key.format(compressed=True)
+        data = pub + i.to_bytes(4, 'big')
+    I = hmac.new(chain, data, hashlib.sha512).digest()
+    ki = (int.from_bytes(I[:32], 'big') + int.from_bytes(priv, 'big')) % _N
+    return ki.to_bytes(32, 'big'), I[32:]
+
+def seed_to_privkey_hd(seed, idx=0):
+    I = hmac.new(b"Bitcoin seed", seed, hashlib.sha512).digest()
+    key, chain = I[:32], I[32:]
+    for i in [44+_H, 60+_H, _H, 0, idx]:
+        key, chain = _child(key, chain, i)
+    return key
+
+# Test 1: Python mnemonic + manual BIP32
+seed_py = Mnemonic("english").to_seed(phrase, "")
+priv_py = seed_to_privkey_hd(seed_py, 0)
+pub = coincurve.PrivateKey(priv_py).public_key.format(compressed=False)[1:]
+addr_manual = to_checksum_address(keccak(pub)[-20:])
+
+# Test 2: eth_account
+acct = Account.from_mnemonic(phrase, account_path="m/44'/60'/0'/0/0")
+
+print(f"Manual BIP32: {addr_manual}")
+print(f"eth_account:  {acct.address}")
+print(f"Target:       {TARGET}")
+print(f"Manual == Target: {addr_manual.lower() == TARGET}")
+print(f"eth_account == Target: {acct.address.lower() == TARGET}")
+print(f"Manual == eth_account: {addr_manual.lower() == acct.address.lower()}")