GMP Redeem Tracing

Step-by-step guide for tracing GMP (Generic Message Passing) redemption transactions on the Ethereum blockchain.

Step 1: Filter Transactions

Filter RedeemForBtc calls on the AssetRouter contract:

Contract: 0x964677F337d6528d659b1892D0045B8B27183fc0

Event Signature: 0x8784acf2b096380844b252c1cc85752ea2dcccf0fd55ed7a440e0ccd3b56b908

View on Etherscan

Step 2: Find MessageSent Event

Open the transaction and navigate to the “Logs” tab. Find the MessageSent event and copy the data.

Step 3: Decode the Data

Open Etherscan’s input data decoder .

Paste the data as Input Data, and use this ABI as Input ABI:


[{
    "inputs": [
      {
        "internalType": "bytes32",
        "name": "pathId",
        "type": "bytes32"
      },
      {
        "internalType": "uint256",
        "name": "nonce",
        "type": "uint256"
      },
      {
        "internalType": "bytes32",
        "name": "sender",
        "type": "bytes32"
      },
      {
        "internalType": "bytes32",
        "name": "recipient",
        "type": "bytes32"
      },
      {
        "internalType": "bytes32",
        "name": "destinationCaller",
        "type": "bytes32"
      },
      {
        "internalType": "bytes",
        "name": "body",
        "type": "bytes"
      }
    ],
    "name": "MessageV1",
    "outputs": [],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [
      {
        "internalType": "bytes32",
        "name": "toChainID",
        "type": "bytes32"
      },
      {
        "internalType": "bytes32",
        "name": "fromToken",
        "type": "bytes32"
      },
      {
        "internalType": "bytes32",
        "name": "redeemer",
        "type": "bytes32"
      },
      {
        "internalType": "bytes",
        "name": "scriptpubkey",
        "type": "bytes"
      },
      {
        "internalType": "uint256",
        "name": "amount",
        "type": "uint256"
      }
    ],
    "name": "redeem",
    "outputs": [],
    "stateMutability": "view",
    "type": "function"
  }]

Click “Decode”.

Step 4: Decode the Body

Copy the body field from the decoded MessageV1 result to the Input Data field and click “Decode” again.

Step 5: Extract Bitcoin Address

In the result you can see toChainID, fromToken, redeemer, scriptpubkey, and amount. The scriptpubkey can be converted to a Bitcoin address.