Proof Of Work Sample

const crypto = require('crypto');

// Block Header
const version = 1;
const previousBlockHash = 'ABC123';
const merkleRoot = 'XYZ789';
const timestamp = 1642931200;
let nonce = 0;

// Difficulty Target
const difficultyTarget = '000';

// Hash Function
function calculateHash(blockHeader) {
  const hash = crypto.createHash('sha256').update(blockHeader).digest('hex');
  return hash;
}

// Brute-Force Search
let hash = '';
while (!hash.startsWith(difficultyTarget)) {
  const blockHeader = version + previousBlockHash + merkleRoot + timestamp + nonce;
  hash = calculateHash(blockHeader);
  nonce++;
}

console.log('Valid Hash Found!');
console.log('Nonce:', nonce - 1);
console.log('Hash:', hash);