gistfile1.py

import ecdsa
import sha3

from bitcoin import encode_pubkey, decode_pubkey

def decompress_secp256k1_pubkey(data):
    x, y = decode_pubkey(data, 'bin_compressed')
    p = ecdsa.ellipticcurve.Point(ecdsa.SECP256k1.curve, x, y)
    return ecdsa.VerifyingKey.from_public_point(p, ecdsa.SECP256k1)

sig = "638A54215D80A6713C8D523A6ADC4E6E73652D859103A36B700851CB0E61B66B8EBFC1A610C57D732EC6E0A8F06A9A7A28DF5051ECE514702FF9CDFF0B11F454"
content = "f854018664697363763582765f82696490736563703235366b312d6b656363616b83697034847f00000189736563703235366b31a103ca634cae0d49acb401d8a4c6b6fe8c55b70d115bf400769cc1400f3258cd3138"
key = "03ca634cae0d49acb401d8a4c6b6fe8c55b70d115bf400769cc1400f3258cd3138"

bsig = bytes.fromhex(sig)
bcontent = bytes.fromhex(content)
bkey = bytes.fromhex(key)

pub = decompress_secp256k1_pubkey(bkey)
print(pub.verify(bsig, bcontent, hashfunc=sha3.keccak_256))

#digest = "d301ce462d3e639518f482c7f03821fec1e602018630ce621e1e7851c12343a6"
#bdigest = bytes.fromhex(digest)