from pycoin.ecdsa import generator_secp256k1, sign, verify

import hashlib, secrets

def sha3_256Hash(msg):

hashBytes = hashlib.sha3_256(msg.encode("utf8")).digest()

return int.from_bytes(hashBytes, byteorder="big")

def signECDSAsecp256k1(msg, privKey):

msgHash = sha3_256Hash(msg)

signature = sign(generator_secp256k1, privKey, msgHash)

return signature

def verifyECDSAsecp256k1(msg, signature, pubKey):

msgHash = sha3_256Hash(msg)

valid = verify(generator_secp256k1, pubKey, msgHash, signature)

return valid

print(signECDSAsecp256k1("hey", 'RCJ9Q6kH5ywdRhchVKrxPUFiJE7cGMKFEB8n9zd4VgdNVYzHNedz'))