how to verify ethereum message -web3 in python

To verify an Ethereum message using Web3 in Python, you can follow these steps:

  1. Import the required packages.
main.py
from web3.auto import w3
import codecs

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  1. Define the message and signature in hexadecimal format.
main.py
message = "Hello, world!"
signature = "0x0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef"

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  1. Decode the signature and extract the v, r, and s values.
main.py
signature_bytes = codecs.decode(signature[2:], 'hex')
v = signature_bytes[-1]
r = int.from_bytes(signature_bytes[:32], byteorder='big')
s = int.from_bytes(signature_bytes[32:64], byteorder='big')

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  1. Use the web3.eth.account.recover_message method to recover the public address of the signer.
main.py
signer = w3.eth.account.recover_message(message, vrs=(v, r, s))

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  1. Compare the recovered public address with the expected public address to verify the message.
main.py
expected_address = "0x0123456789abcdef0123456789abcdef0123456"
if signer.lower() == expected_address.lower():
    print("Message signature is valid!")
else:
    print("Message signature is invalid.")

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Note that the expected public address should match the address of the signer who signed the message. If the two addresses don't match, the message signature is not valid.

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related categories

ethereum
web3
python
verification
message signature

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