1

I am able to use ecRecover to verify the signer in Javascript, for example:

const ecRecoverAddr = await window.ethereum.request({
    method: "personal_ecRecover",
    params: [message, signedMessage],
});

However, when I try the following Python code:

from web3 import Web3, HTTPProvider

def verify(request, message, signedMessage):
    response = web3.geth.personal.ecRecover(message, signature)
    return HttpResponse(response, content_type='text/json')

I get this error: name 'web3' is not defined

Does this mean that I need to instantiate some sort of provider for web3? What should be done?

Is there a way to retrieve the public key using ecRecover without the use of a provider?

Shouldn't it just be a method that can run without any connections?

Thanks!

1 Answer 1

1

You will need to instantiate the web3 object and cannot refer to a package here.

from web3 import Web3, HTTPProvider

w3 = Web3(Web3.HTTPProvider(<infura or alchemy URL>))

def verify(request, message, signedMessage):
    response = w3.geth.personal.ecRecover(message, signature)
    return HttpResponse(response, content_type='text/json')
2
  • For anyone else who may come across this post, use w3.eth.account.recover_message instead of the incorrect w3.geth.personal.ecRecover. The signedMessage that I have comes from Web3.js, and is in the form 0xb47b9215304122fe5ae23aa6e89d9f01c8497fbeb903b8e8602e2db3d235c8af3f6b8fee791019045f44fe61dd9af193e3d241b108311893d1db852dc7d76d811c however, when I try to pass that to w3.eth.account.recover_message in Python, I get the following error: 'str' object has no attribute 'version'. What do I need to do?
    – dx1
    Oct 7, 2021 at 2:25
  • @dx1 I recommend to create a new question for that issue.
    – Ismael
    Oct 8, 2021 at 17:44

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