Create an offer -> Invalid order signature #643

ServantMaximus · 2022-08-27T10:27:56Z

ServantMaximus
Aug 27, 2022

Hi,

I am trying to use the https://api.opensea.io/v2/orders/ethereum/seaport/offers endpoint to create an offer.
Docs: https://docs.opensea.io/v2.0/reference/create-an-offer

3 parameters need to be fulfilled:

Parameters: I create json input (=message) that is correct. The value of the msg variable in the code below is the input for this field.
Signature: I sign my json input (=message) using the code below and fill in the signature in this field
API Key ✅

However I get the error:
"errors": [
"['Invalid order signature']"
]

I am a bit clueless on why my signature is invalid?

My Python code to generate the signature:

from web3.auto import w3
from eth_account.messages import encode_defunct
from hexbytes import HexBytes
import requests
import json

msg = '''{"offerer":"0x709e101d81A76B38800F5fE4E390CC32b7c854a7","offer":[{"itemType":1,"token":"0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2","identifierOrCriteria":"0","startAmount":"10000000000000000","endAmount":"10000000000000000"}],"consideration":[{"itemType":2,"token":"0xF87E31492Faf9A91B02Ee0dEAAd50d51d56D5d4d","identifierOrCriteria":"36410213260540415590581082995199198625690","startAmount":"1","endAmount":"1","recipient":"0x709e101d81A76B38800F5fE4E390CC32b7c854a7"},{"itemType":1,"token":"0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2","identifierOrCriteria":"0","startAmount":"250000000000000","endAmount":"250000000000000","recipient":"0x9A6ebE7E2a7722F8200d0ffB63a1F6406A0d7dce"}],"totalOriginalConsiderationItems":2,"startTime":"1661679182","endTime":"1661765694","orderType":2,"zone":"0x004C00500000aD104D7DBd00e3ae0A5C00560C00","zoneHash":"0x0000000000000000000000000000000000000000000000000000000000000000","salt":5578881512597576,"conduitKey":"0x0000007b02230091a7ed01230072f7006a004d60a8d4e71d599b8104250f0000","counter":0}'''

private_key = "0xprivate key"
message = encode_defunct(text=msg)
signed_message =  w3.eth.account.sign_message(message, private_key=private_key)
signature = HexBytes.hex(signed_message.signature)

print(signature)

Answered by granolaboy

Jan 23, 2023

Hi everyone!

Was having the same problem trying to produce a valid EIP-712 signature to create a new listing in python.

My issue was that I was using old eth libs. encode_structured_data is bugged in older versions (in particular with arrays).

do this:

pip list --outdated

and if you see anything with "web3" or "eth" in its name - you need to update your libs to the latest versions. I had to remove brownie and eip712 due to version conflicts.

This is what mine looks like in the end (with the dict pretty-printed and pasted in. You can figure out how to make that dict yourself.

I'm listing a Mori Mori (contract 0x85203d271c09ea3d76688753B6f616aEF1e09B12 token id 248 erc-721) for 0.1 ETH

…

View full answer

ServantMaximus · 2022-08-27T20:25:04Z

ServantMaximus
Aug 27, 2022
Author

Additionally:

I signed the message below using etherscan:
{"offerer":"0x709e101d81A76B38800F5fE4E390CC32b7c854a7", "offer": [{"itemType":1,"token":"0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2","identifierOrCriteria":"0","startAmount":"10000000000000000","endAmount":"10000000000000000"}], "consideration":[ {"itemType":2,"token":"0xF87E31492Faf9A91B02Ee0dEAAd50d51d56D5d4d","identifierOrCriteria":"22458636216781938588582724090496701955961","startAmount":"1","endAmount":"1","recipient":"0x709e101d81A76B38800F5fE4E390CC32b7c854a7"}, {"itemType":1,"token":"0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2","identifierOrCriteria":"0","startAmount":"250000000000000","endAmount":"250000000000000","recipient":"0x9A6ebE7E2a7722F8200d0ffB63a1F6406A0d7dce"}], "totalOriginalConsiderationItems":2, "startTime":"1661967100", "endTime":"1661969099", "orderType":2, "zone":"0x004C00500000aD104D7DBd00e3ae0A5C00560C00", "zoneHash":"0x0000000000000000000000000000000000000000000000000000000000000000", "salt":5578881512597576, "conduitKey":"0x0000007b02230091a7ed01230072f7006a004d60a8d4e71d599b8104250f0000", "counter":0}

I generate the signature on https://etherscan.io/verifiedSignatures#.

I than used the generated signature to test using the browser, still not working:
The generated signature by etherscan corresponds with the signature that my Python code generates, so I assume this should be a correct signature...

This generated the following Python code:
`import requests

url = "https://api.opensea.io/v2/orders/ethereum/seaport/offers"

payload = {
"parameters": {
"offerer": "0x709e101d81A76B38800F5fE4E390CC32b7c854a7",
"offer": [
{
"itemType": 1,
"token": "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2",
"identifierOrCriteria": "0",
"startAmount": "10000000000000000",
"endAmount": "10000000000000000"
}
],
"consideration": [
{
"itemType": 2,
"token": "0xF87E31492Faf9A91B02Ee0dEAAd50d51d56D5d4d",
"identifierOrCriteria": "22458636216781938588582724090496701955961",
"startAmount": "1",
"endAmount": "1",
"recipient": "0x709e101d81A76B38800F5fE4E390CC32b7c854a7"
},
{
"itemType": 1,
"token": "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2",
"identifierOrCriteria": "0",
"startAmount": "250000000000000",
"endAmount": "250000000000000",
"recipient": "0x9A6ebE7E2a7722F8200d0ffB63a1F6406A0d7dce"
}
],
"totalOriginalConsiderationItems": 2,
"startTime": "1661967100",
"endTime": "1661969099",
"orderType": 2,
"zone": "0x004C00500000aD104D7DBd00e3ae0A5C00560C00",
"zoneHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
"salt": 5578881512597576,
"conduitKey": "0x0000007b02230091a7ed01230072f7006a004d60a8d4e71d599b8104250f0000",
"counter": 0
},
"signature": "0x663ed43b9ee8d02bed381d4381ebc03bd6040f347b531dc0d12fb5d95f5e57132d7676a0207a45ad5c89bed2b3216848119873c4e576e17d173233b371c4b64b1b"
}
headers = {
"Accept": "application/json",
"X-API-KEY": "My Opensea API KEY",
"Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)`

0 replies

malihdabboussi · 2022-11-16T22:27:49Z

malihdabboussi
Nov 16, 2022

i am getting the same error message when doing listing

1 reply

onessss Feb 7, 2023

have you resolved it？

ryanio · 2022-12-09T19:39:38Z

ryanio
Dec 9, 2022
Collaborator

You have to sign the order using EIP-712

2 replies

AliMurtazaJaffery Jan 8, 2023

Hi! can you share the code in Python for the signature part?
\

AliMurtazaJaffery Jan 8, 2023

@ryanio

granolaboy · 2023-01-23T20:14:41Z

granolaboy
Jan 23, 2023

Hi everyone!

Was having the same problem trying to produce a valid EIP-712 signature to create a new listing in python.

My issue was that I was using old eth libs. encode_structured_data is bugged in older versions (in particular with arrays).

do this:

pip list --outdated

and if you see anything with "web3" or "eth" in its name - you need to update your libs to the latest versions. I had to remove brownie and eip712 due to version conflicts.

This is what mine looks like in the end (with the dict pretty-printed and pasted in. You can figure out how to make that dict yourself.

I'm listing a Mori Mori (contract 0x85203d271c09ea3d76688753B6f616aEF1e09B12 token id 248 erc-721) for 0.1 ETH

    message = {'domain': {'chainId': 1,
            'name': 'Seaport',
            'verifyingContract': '0x00000000006c3852cbEf3e08E8dF289169EdE581',
            'version': '1.1'},
 'message': {'conduitKey': b'\x00\x00\x00{\x02#\x00\x91\xa7\xed\x01#'
                           b'\x00r\xf7\x00j\x00M`\xa8\xd4\xe7\x1dY\x9b\x81\x04'
                           b'%\x0f\x00\x00',
             'consideration': [{'endAmount': 92000000000000000,
                                'identifierOrCriteria': 0,
                                'itemType': 0,
                                'recipient': '0x0063E887827B5c5f531d0C9559478842c57Ef7Ab',
                                'startAmount': 92000000000000000,
                                'token': '0x0000000000000000000000000000000000000000'},
                               {'endAmount': 2500000000000000,
                                'identifierOrCriteria': 0,
                                'itemType': 0,
                                'recipient': '0x0000a26b00c1F0DF003000390027140000fAa719',
                                'startAmount': 2500000000000000,
                                'token': '0x0000000000000000000000000000000000000000'},
                               {'endAmount': 5500000000000000,
                                'identifierOrCriteria': 0,
                                'itemType': 0,
                                'recipient': '0xA81cA450D7ea11efEe17d6b4A8f743B3b6AE46e0',
                                'startAmount': 5500000000000000,
                                'token': '0x0000000000000000000000000000000000000000'}],
             'counter': 1,
             'endTime': 1674505418,
             'offer': [{'endAmount': 1,
                        'identifierOrCriteria': 248,
                        'itemType': 2,
                        'startAmount': 1,
                        'token': '0x85203d271c09ea3d76688753B6f616aEF1e09B12'}],
             'offerer': '0x0063e887827b5c5f531d0c9559478842c57ef7ab',
             'orderType': 2,
             'salt': 94632875894598549038100692318865073957,
             'startTime': 1674504218,
             'zone': '0x004c00500000ad104d7dbd00e3ae0a5c00560c00',
             'zoneHash': b'1\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
                         b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
                         b'\x00\x00\x00\x00\x00\x00\x00\x00'},
 'primaryType': 'OrderComponents',
 'types': {'ConsiderationItem': [{'name': 'itemType', 'type': 'uint8'},
                                 {'name': 'token', 'type': 'address'},
                                 {'name': 'identifierOrCriteria',
                                  'type': 'uint256'},
                                 {'name': 'startAmount', 'type': 'uint256'},
                                 {'name': 'endAmount', 'type': 'uint256'},
                                 {'name': 'recipient', 'type': 'address'}],
           'EIP712Domain': [{'name': 'name', 'type': 'string'},
                            {'name': 'version', 'type': 'string'},
                            {'name': 'chainId', 'type': 'uint256'},
                            {'name': 'verifyingContract', 'type': 'address'}],
           'OfferItem': [{'name': 'itemType', 'type': 'uint8'},
                         {'name': 'token', 'type': 'address'},
                         {'name': 'identifierOrCriteria', 'type': 'uint256'},
                         {'name': 'startAmount', 'type': 'uint256'},
                         {'name': 'endAmount', 'type': 'uint256'}],
           'OrderComponents': [{'name': 'offerer', 'type': 'address'},
                               {'name': 'zone', 'type': 'address'},
                               {'name': 'offer', 'type': 'OfferItem[]'},
                               {'name': 'consideration',
                                'type': 'ConsiderationItem[]'},
                               {'name': 'orderType', 'type': 'uint8'},
                               {'name': 'startTime', 'type': 'uint256'},
                               {'name': 'endTime', 'type': 'uint256'},
                               {'name': 'zoneHash', 'type': 'bytes32'},
                               {'name': 'salt', 'type': 'uint256'},
                               {'name': 'conduitKey', 'type': 'bytes32'},
                               {'name': 'counter', 'type': 'uint256'}]}}

    signable_message = encode_structured_data(message)
    signed_message = web3.eth.account.sign_message(signable_message, private_key)
    signature = signed_message['signature'].hex()

4 replies

granolaboy Feb 9, 2023

https://github.com/ConsenSysMesh/py-eip712-structs may be of help to you. You are creating an EIP-712 signature.

You have to get the consideration items from the contracts endpoint.

hao0707 Feb 9, 2023

https://github.com/ConsenSysMesh/py-eip712-structs may be of help to you. You are creating an EIP-712 signature.

You have to get the consideration items from the contracts endpoint.
Hi,have you successfully placed an order through the opensea api using this method?

onessss Feb 9, 2023

https://github.com/ConsenSysMesh/py-eip712-structs may be of help to you. You are creating an EIP-712 signature.
You have to get the consideration items from the contracts endpoint.
Hi,have you successfully placed an order through the opensea api using this method?

i have resolve this issues,thank ur reply

hao0707 Feb 9, 2023

https://github.com/ConsenSysMesh/py-eip712-structs may be of help to you. You are creating an EIP-712 signature.
You have to get the consideration items from the contracts endpoint.
Hi,have you successfully placed an order through the opensea api using this method?

i have resolve this issues,thank ur reply

Hi,can you show your code？I have been troubled by this for a long time,thank you very much!

Provide feedback

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Create an offer -> Invalid order signature #643

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ServantMaximus Aug 27, 2022 Author

ryanio Dec 9, 2022 Collaborator

Replies: 4 comments 7 replies

ServantMaximus
Aug 27, 2022
Author

ryanio
Dec 9, 2022
Collaborator