Invalid signature for BNB through Walletconnect 2.0

[0x-General]

Description
When signing & broadcasting a send transaction for BNB through walletconnect, the BNB node responds with a message saying:

{
    "code": 401,
    "failed_tx_index": 0,
    "message": "signature verification failed",
    "success_tx_results": []
}

Looks like the signing process is incorrect.
To Reproduce

• Connect to https://thorswap.github.io/SwapKit/
• Try to make a send transaction with BNB & Walletconnect

Expected behavior
The node should process the transaction with no error messages.

Additional context
This is the message that is being broadcasted:

{
    "sequence": 1,
    "accountNumber": 7446375,
    "chainId": "Binance-Chain-Tigris",
    "msg": {
        "inputs": [
            {
                "address": {
                    "type": "Buffer",
                    "data": [
                        92,
                        12,
                        151,
                        228,
                        69,
                        248,
                        21,
                        153,
                        106,
                        172,
                        199,
                        153,
                        138,
                        210,
                        170,
                        200,
                        64,
                        182,
                        172,
                        235
                    ]
                },
                "coins": [
                    {
                        "denom": "BNB",
                        "amount": 10000
                    }
                ]
            }
        ],
        "outputs": [
            {
                "address": {
                    "type": "Buffer",
                    "data": [
                        92,
                        12,
                        151,
                        228,
                        69,
                        248,
                        21,
                        153,
                        106,
                        172,
                        199,
                        153,
                        138,
                        210,
                        170,
                        200,
                        64,
                        182,
                        172,
                        235
                    ]
                },
                "coins": [
                    {
                        "denom": "BNB",
                        "amount": 10000
                    }
                ]
            }
        ],
        "aminoPrefix": "2A2C87FA"
    },
    "memo": "",
    "source": 0,
    "signatures": [
        {
            "pub_key": {
                "type": "Buffer",
                "data": [
                    235,
                    90,
                    233,
                    135,
                    33,
                    2,
                    201,
                    141,
                    200,
                    60,
                    209,
                    67,
                    70,
                    142,
                    117,
                    45,
                    158,
                    247,
                    52,
                    74,
                    209,
                    0,
                    202,
                    92,
                    120,
                    6,
                    25,
                    166,
                    147,
                    180,
                    191,
                    8,
                    54,
                    217,
                    80,
                    191,
                    242,
                    186
                ]
            },
            "signature": {
                "type": "Buffer",
                "data": [
                    235,
                    204,
                    17,
                    136,
                    181,
                    5,
                    97,
                    1,
                    70,
                    136,
                    113,
                    199,
                    209,
                    96,
                    82,
                    20,
                    82,
                    206,
                    217,
                    56,
                    77,
                    46,
                    254,
                    179,
                    110,
                    251,
                    214,
                    198,
                    59,
                    165,
                    192,
                    114,
                    13,
                    42,
                    85,
                    74,
                    254,
                    152,
                    208,
                    66,
                    32,
                    233,
                    118,
                    241,
                    203,
                    112,
                    40,
                    121,
                    16,
                    10,
                    0,
                    21,
                    117,
                    69,
                    3,
                    62,
                    59,
                    45,
                    95,
                    129,
                    173,
                    166,
                    221,
                    139,
                    1
                ]
            },
            "account_number": 7446375,
            "sequence": 1
        }
    ]
}

[satoshiotomakan]

Hi @0x-General, could you please help to find out actual request and expected response payloads?
I used https://thorswap.github.io/SwapKit/ to generate a send or swap requests with BNB chain, here's what I got:

• cosmos_signAmino Send (standard transfer) request: https://gist.github.com/satoshiotomakan/ff31ee75455a4e8691ff38a4f7b2c498
• cosmos_signAmino Swap (THORSwap) request: https://gist.github.com/satoshiotomakan/76a7f21c57e46bb2e6940a70d64b512f

These requests do not match the documentation:

1. There is no request.signDoc.fee - probably, it supposes to be optional?
2. request.signDoc.msgs do not have type and value fields.

Can we expect cosmos_signDirect request instead?

Could you please also advice, did you get this response from the TrustWallet Android app?

[satoshiotomakan]

One note - https://thorswap.github.io/SwapKit/ generates an expected payload on cosmos_signAmino for THORChain: https://gist.github.com/satoshiotomakan/e72631f61cbee10cc81dc0469e1e270e

[satoshiotomakan]

Hi @0x-General, we adopted WalletCore API to be able to parse and handle BNB signing requests through WalletConnect 2.0. The new Android/iOS releases coming soon