BlockCypher以太坊测试网交易签名验证失败问题求助

Let's walk through your problems and fix them one by one, like we're debugging together:

1. Fixing "Address computed from signature differs from provided one" Error #

This error almost always boils down to a mismatch between the address your signature resolves to and the from address you're sending to the API. Here's how to debug it step by step:

• Verify Private Key & Address Match First
  Start with the basics: confirm your private key actually belongs to address 0xF6A14d976c86bDbe050cA9426aD491d750be33B1. Use a quick snippet with ethers.js to check:

  const { Wallet } = require("ethers");
  const privateKey = "YOUR_ADDRESS_2_PRIVATE_KEY"; // Include the 0x prefix
  const wallet = new Wallet(privateKey);
  console.log(wallet.address); // Should output 0xF6A14d976c86bDbe050cA9426aD491d750be33B1
  

  If this doesn't match, you're using the wrong private key—stop here and correct that.

• Fix Signature Generation
  BlockCypher's tosign value needs a strict ECDSA signature using the secp256k1 curve. Common mistakes here include:

  • Signing a malformed version of tosign (use the exact hex string returned, no extra spaces or prefixes)
  • Using the wrong v value (Ethereum uses v=27 or v=28 for legacy transactions; some libraries return 0/1 which need +27 added)
  • Submitting a lowercase from address instead of the checksum format (BlockCypher enforces checksum validation for some endpoints—always use the mixed-case address like 0xF6A14d976c86bDbe050cA9426aD491d750be33B1)

  Try generating the signature with a standard library to avoid manual errors:

  const { Wallet } = require("ethers");
  const privateKey = "YOUR_ADDRESS_2_PRIVATE_KEY";
  const toSign = "THE_TOSIGN_VALUE_FROM_BLOCKCYPHER";
  const wallet = new Wallet(privateKey);
  // Sign the hex-encoded tosign data directly
  const signature = wallet.signMessage(Buffer.from(toSign, "hex"));
  

  Submit this signature along with the correct checksum from address to the Send Transaction endpoint.

• Validate Signature Recovery
  Test if your signature correctly resolves to your address with this snippet:

  const { utils } = require("ethers");
  const recoveredAddress = utils.verifyMessage(Buffer.from(toSign, "hex"), signature);
  console.log(recoveredAddress); // Should match your address 2
  

  If this doesn't match, your signing logic is flawed—recheck every step of how you're handling the tosign value.

2. Understanding Raw Hex-Encoded Transactions #

A raw transaction is the RLP-encoded hex string of a complete Ethereum transaction object. It includes these mandatory fields (all in hex format):

• nonce: Number of previous transactions sent from your from address (prevents replay attacks)
• gasPrice: Price per unit of gas (in wei)
• gasLimit: Maximum gas allowed for the transaction (21000 is standard for simple transfers)
• to: Recipient address (hex-encoded)
• value: Amount to transfer (in wei, hex-encoded)
• data: Optional data field (empty hex string for simple transfers)
• v, r, s: Signature components generated by signing the transaction with your private key

To generate a valid raw transaction without manual hassle, use ethers.js:

const { Wallet, utils } = require("ethers");
const privateKey = "YOUR_ADDRESS_2_PRIVATE_KEY";
const wallet = new Wallet(privateKey);

// Fetch the current nonce (critical to avoid transaction failures)
const nonce = await wallet.getTransactionCount();

const txParams = {
  nonce: utils.hexlify(nonce),
  gasPrice: utils.hexlify(1000000000), // 1 gwei, adjust based on testnet conditions
  gasLimit: utils.hexlify(21000),
  to: "YOUR_ADDRESS_1",
  value: utils.hexlify(1200000000000000),
  chainId: 11155111, // Use BlockCypher testnet's correct chainId (confirm via their API)
};

// Sign and generate the raw transaction hex string
const rawTx = await wallet.signTransaction(txParams);

You can submit this rawTx string directly to BlockCypher's Raw Transaction endpoint.

Final Quick Checks #

• Confirm BlockCypher's testnet chainId (check their chain info API) — using the wrong chainId will break signature validation.
• Ensure address 2 has enough testnet ETH to cover both the transfer amount and gas fees (your 1000000000000000000 wei should be more than enough, but double-check gas calculations).

内容的提问来源于stack exchange，提问作者noiseFree