sig.py

from web3.auto import w3
from eth_account.messages import (encode_intended_validator, encode_defunct)
from base64 import urlsafe_b64encode, urlsafe_b64decode

# The message to be hashed and signed
endpoint = "changeMPC";
new_address = urlsafe_b64decode("kQAs9VlT6S776tq3unJcP5Ogsj-ELLunLXuOb1EKcOQi47nL")
bridge_address = urlsafe_b64decode("EQDWGekyogF4bnuC93oCTFhgJI6pKvsbDbDBGBWSmecEjDNK")
message = endpoint.encode() + new_address[0:20] + bytes([0x00]) + bridge_address[0:20];

# Hash the message using keccak256
message_hash = w3.keccak(hexstr=message.hex())

# Generate a new Ethereum account (for demonstration)
signer = w3.eth.account.create()

# Generate a new Ethereum account (for demonstration)
#validator_account = w3.eth.account.create()

# Sign the hashed message using the account's private key
#message_encoded = encode_defunct(message_hash)
#message_encoded = encode_intended_validator(validator_account.address, message_hash)
#print(message_encoded);
#signed_message = w3.eth.account.sign_message(message_encoded, private_key=account._private_key)
signed_message = w3.eth.account.signHash(message_hash, private_key=signer._private_key)
#print(len(signed_message.signature))
print("Sender address:", signer.address)
print("Sender address public key:", signer._key_obj.public_key)
print("Signature:", signed_message.signature.hex())