proof_of_work.js

function proof_of_work(difficulty, prev_hash, timestamp, merkle_root) {
  var hash = “1111111111111111111111111111111111111111111111111111111111111111”;
  var nonce = 0;
  //check if hash meets difficulty criteria (by counting number of zeros)
  while (hash.substring(0, difficulty) !== Array(difficulty + 1).join("0")) {
    //incrementing the nonce value every time the loop runs.
    nonce++;
    //recalculating the hash value
    hash = this.calculateHash(nonce, prev_hash, timestamp, merkle_root);
  }
  console.log("Block mined: " + hash)
}