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How to sign Bitcoin transaction via KeyChain
Dmitry edited this page Mar 31, 2019
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Here you can find an instruction on how to sign a Bitcoin transaction with KeyChain.
1. Download and install KeyChain for macOS
Start with the command `wscat -c ws://localhost:16384/, then select a key.
{
"command": "select_key"
}
const bitcoin = require ('bitcoinjs-lib');
const publicKey = 'YOUR_PUBLIC_KEY'; // 08d6770d8219923fe25a4d6aeb2c171253d5de3bc225f09dbfb2cb93ed837be1a80fdd3af5046b8f1f5412e5b321dcc3c25be9f4dd285250421ea55071794277
const publicKeyCompressed = Buffer.from(`03${publicKey.substr(0, 64)}`, 'hex');
const keyPair = bitcoin.ECPair.fromPublicKeyBuffer(publicKeyCompressed, bitcoin.networks.testnet);
const address = keyPair.getAddress();
In case you work with testnet - https://coinfaucet.eu/en/btc-testnet/
const fetch = require('node-fetch');
const API_URL = 'https://test-insight.bitpay.com/api';
const address = 'YOUR_ADDRESS'; // myLrbwvwJN59quivKSxCxgiqLdCw8m7aDf
fetch(`${API_URL}/addr/${address}`)
.then( data => data.json() )
.then(({ balance }) => console.log('BTC Balance: ', balance));
You can find an example of the code here