index.js

const BTCMiner = require('bitcoin-miner');
// View this block in Block Explorer:  https://insight.bitpay.com/block/00000000000000000020cf2bdc6563fb25c424af588d5fb7223461e72715e4a9
// Get it in JSON format: https://insight.bitpay.com/api/block/00000000000000000020cf2bdc6563fb25c424af588d5fb7223461e72715e4a9
const block = {
    version: 536870912,
    previousblockhash: '00000000000000000061abcd4f51d81ddba5498cff67fed44b287de0990b7266',
    merkleroot: '871148c57dad60c0cde483233b099daa3e6492a91c13b337a5413a4c4f842978',
    time: 1515252561,
    bits: '180091c1'
};

const miner = new BTCMiner(block);
let hash;
let found = false;


let nonce = 45281998 // initial nonce
while (!found) { 
    hash = miner.getHash(nonce);
    console.log(hash.toString('hex'));
    document.getElementById('hash').textContent = hash.toString('hex');
    found = miner.checkHash(hash);
    if (found) {
		miner.verifyNonce(block, nonce);
	}
    nonce++;
}