Transaction fails to validate (Error running script)

Question

I've created a transaction on the TESTNET and am trying to push it via BlockCyphers facility at:

https://live.blockcypher.com/btc-testnet/pushtx/

when I make the attempt, I get the following error:

Error validating transaction: Error running script for input 0 referencing 261190892daa2c9aaaf25c20624f7f2941d2ad58dec883b0c929d1fa9306fd57 at 0: Script was NOT verified successfully..

here's the transaction. I don't see what the matter with it is and not sure I understand the error. can anyone help?

{
    "addresses": [
        "mjGtZWXgPdbLUZYWtDqVTfbFieVzXFfSEj", 
        "2N7nSZjfqikj4oVkCqaLB3CNMY3TA72PbNY", 
        "msp7depXvcjLqykZxYVrWNG9QgKqLWWKEN"
    ], 
    "block_height": -1, 
    "block_index": -1, 
    "confirmations": 0, 
    "double_spend": false, 
    "fees": 12375, 
    "hash": "463372d7a8f456c882179635aabbeca4146396b1f81c05699a2e885e3f84d6e6", 
    "inputs": [
        {
            "addresses": [
                "mjGtZWXgPdbLUZYWtDqVTfbFieVzXFfSEj"
            ], 
            "age": 1657999, 
            "output_index": 0, 
            "output_value": 5000000, 
            "prev_hash": "261190892daa2c9aaaf25c20624f7f2941d2ad58dec883b0c929d1fa9306fd57", 
            "script": "48304502210093b8ff9180a8a31a5ee7b0fb6c560aef888a3d53576e530cb4601dce2d3c51da02204fd8a28743f1d1100a2f56428e743501091e833550df6cf540bad4f5248a6d3c012102d794c7e1a8068782ef6ee68acf9f6ad9c84c78349671c1a7bf60418a8e1ed108", 
            "script_type": "pay-to-pubkey-hash", 
            "sequence": 4294967295
        }
    ], 
    "outputs": [
        {
            "addresses": [
                "2N7nSZjfqikj4oVkCqaLB3CNMY3TA72PbNY"
            ], 
            "script": "a9149f792783320ffb5a4f3ee4c69525d4932ac0497087", 
            "script_type": "pay-to-script-hash", 
            "value": 500
        }, 
        {
            "addresses": [
                "msp7depXvcjLqykZxYVrWNG9QgKqLWWKEN"
            ], 
            "script": "76a91486e0602ab38efd1811ff4db76f7d58c717c8598888ac", 
            "script_type": "pay-to-pubkey-hash", 
            "value": 4987125
        }
    ], 
    "preference": "high", 
    "received": "2020-01-10T05:09:49.945289619Z", 
    "relayed_by": "54.197.194.161", 
    "size": 224, 
    "total": 4987625, 
    "ver": 2, 
    "vin_sz": 1, 
    "vout_sz": 2
}

- Addendum I -

to help narrow down the solution, here's the code I'm using to produce the transaction: I first produce an address where to receive some coin:

const btc = require('bitcoinjs-lib');
const bip39 = require('bip39');
const bip32 = require('bip32');

var mnem = 'my-12-word-bip39-seed-phrase'
var root = = bip32.fromSeed(
  bip39.mnemonicToSeedSync(mnem), bitcoin.networks.testnet
);
var p = "m/44'/1'/0'/0/0"
var pubkey = root.derivePath(p).publicKey;
var {address} = btc.payments.p2pkh({pubkey, network: btc.networks.testnet});
console.log(address);

which yields mjGtZWXgPdbLUZYWtDqVTfbFieVzXFfSEj. I then send some coin to that address and attempt to create my transaction:

const CS = require('coinselect');
var feeRate = 55;
var env = 'test3'
var src = 'mjGtZWXgPdbLUZYWtDqVTfbFieVzXFfSEj'
var url = `https://api.blockcypher.com/v1/btc/${env}/addrs/${src}?unspendOnly=true`;
var o = await fetch(url).then(res => res.json());
var utxos = o.txrefs.map(o => ({
    txId: o.tx_hash, 
    vout: parseInt(o.tx_output_n), 
    value: parseInt(o.value)
}));
var targets = [{address: '2N7nSZjfqikj4oVkCqaLB3CNMY3TA72PbNY', value: 500}];
var {inputs, outputs, fee} = CS(utxos, targets, feeRate);
if (ret.outputs) ret.outputs.forEach(o => {
    if (!o.address) o.address = 'msp7depXvcjLqykZxYVrWNG9QgKqLWWKEN';
})

// builds the transaction
var tx = new btc.TransactionBuilder(btc.networks.testnet);
inputs.forEach(o => tx.addInput(o.txId, o.vout));
outputs.forEach(o => tx.addOutput(o.address, o.value));
tx.sign(0, root);
console.log(tx.build().toHex());

from which I get a numerical string that converts to the above transaction. as can be seen, I'm using the same root to sign the transaction that was used to create the source address

Can you show or tell us how you are creating your transaction? Hard to say without more info. — m1xolyd1an, Jan 10 '20 at 05:36

score 1 · Accepted Answer · answered Jan 10 '20 at 06:38

1

You have the wrong public key inside your SignatureScript:

Sig: 48-304502210093b8ff9180a8a31a5ee7b0fb6c560aef888a3d53576e530cb4601dce2d3c51da02204fd8a28743f1d1100a2f56428e743501091e833550df6cf540bad4f5248a6d3c-01
pubkey: 21-02d794c7e1a8068782ef6ee68acf9f6ad9c84c78349671c1a7bf60418a8e1ed108

The outpoint you are spending (2611[...]fd57:0) has the following PubkeyScript:

76-a9-14-2937902660c169b9381a5b3eb35cc889a4686a85-88-ac

When the script runs it fails on 0x88 (or OP_EqualVerify) because HASH160 of the given public key (02d7[...]d108) is e652ed9163ac72629584ec92f47602cca45aa969

answered Jan 10 '20 at 06:38

Coding Enthusiast

1,438
5
23

amazing feedback. I will try to follow your logic and figure it out. thanks a million – ekkis Jan 10 '20 at 07:16
I've added code to the post to clarify how I'm building the transaction and what I'm using to sign – ekkis Jan 10 '20 at 07:43
ok. I've come to understand what you said, and I gather that the field inputs[0].script is populated by my call to the transaction builder's sign() function. that doesn't match the script-pubkey that Block.io generated when I sent coins from there to my address mjGtZWXgPdbLUZYWtDqVTfbFieVzXFfSEj... so the question is why that would happen (and how to fix it) – ekkis Jan 10 '20 at 08:00
FWIW, if I console.log(pubkey.toString('hex') I get: 026c4df6ad30a627bcb045faf913bb25aad26ef9d06a838f8465aead0a63c869ad... which seems to be the Hash160 of 15iBr8YmiWhXbCWRtZhuY9zowF412EwCypjNvY3xX79CX12K8ZH – ekkis Jan 10 '20 at 08:06
as you can see, I'm passing the root directly to the signature function. originally I was converting to a WIF and then to a key, but I was told I could pass the root directly. see: https://github.com/bitcoinjs/bip39/issues/129#issuecomment-572365691 – ekkis Jan 10 '20 at 08:17
I'm not familiar with bitcoinjs library you have to check the source code/read its docs. But it seems to me that you are passing the "root key" in both your tries. To sign a transaction you need the same "child" key that was used to create the address not the root. – Coding Enthusiast Jan 10 '20 at 08:58
yes. you're correct. it took me a while to figure out how to fix it but you gave me all I needed. I owe you a beer – ekkis Jan 10 '20 at 22:43

Transaction fails to validate (Error running script)

1 Answers1