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I'm trying to sign and push a transaction using ethereumjs and Infura. It seems to be working and I'm getting a transaction hash back, but the transaction is not visible on Etherscan, and when I'm trying to push the hash through a service like this I get an error: 

Error! Unable to broadcast Tx : {"jsonrpc":"2.0","error":{"code":-32602,"message":"Invalid RLP.","data":"RlpExpectedToBeList"},"id":1}

This is the code I'm using: 

var Web3 = require('web3');
var web3 = new Web3(new 
Web3.providers.HttpProvider('https://ropsten.infura.io/v3/my_api_key'));
var util = require('ethereumjs-util');
var tx = require('ethereumjs-tx');

var rawTx = {
    nonce: web3.toHex(1),
    gasPrice: web3.toHex(20000000000),
    gasLimit: web3.toHex(30000000000),
    to:... 
    value: web3.toHex(1000000),
    data: '0xc0de',
    networkId: 3
};

var privateKey = '0x...';
var p = new Buffer.from(privateKey.substring(2), 'hex');
var transaction = new tx(rawTx);
transaction.sign(p);
console.log("tx hash = " + util.bufferToHex(transaction.hash(true)));

What am I missing?

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1 Answer 1

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1
+50

It's

let p = new Buffer(privateKey, "hex");

and of course don't forget to serialize: 

var serializedTx = "0x" + transaction.serialize().toString('hex');

and the serialized transaction is what you feed into web3.eth.sendRawTransaction.

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6
  • Thanks. Looks like the transaction goes through on Ropsten but it seems to be stuck on pending for over an hour now, and I cannot see it in the address transactions either. https://ropsten.etherscan.io/tx/0xd5b53084af1b76d38848630b52add44e3aaaaa52bfa790285615f909329567ce. Any idea why?
    – Eddy
    Commented Jul 30, 2018 at 11:58
  • for that particular one the gas limit seems a bit high: 9484321 is what etherscan tells me.
    – n1cK
    Commented Jul 30, 2018 at 12:41
  • So the transaction did not go though? Which gas limit should I specify?
    – Eddy
    Commented Jul 30, 2018 at 13:39
  • technically, it's not being mined. I'm seeing ropsten accepting higher gas limits than mainnet. Either way, it's still a bit above average: "( Warning: The GAS for this Txn exceeds the Avg GasLimit of 9,470,229 for the last 50 Blocks )" says etherscan. so go with 9000000 or something smaller, but big enough to execute whatever you're planning to ;)
    – n1cK
    Commented Jul 30, 2018 at 13:46
  • 1
    Would have helped you out even without a bounty ;) It's more a thing of how poorly these things are documented and how few people are out there who mess around with these things.
    – n1cK
    Commented Aug 1, 2018 at 8:19

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