Scan the Handshake Blockchain for Outputs Related to an Auction

hsd-auction-scan.js

const {NodeClient} = require('hs-client');
const sha3 = require('bcrypto/lib/sha3');
const TX = require('hsd/lib/primitives/tx');

const client = new NodeClient({
  host: '127.0.0.1',
  port: 12037
});

(async () => {

  const name = 'music';
  const nameHash = sha3.digest(Buffer.from(name, 'ascii'));

  const info = await client.getInfo();
  const height = info.chain.height;

  const out = {
    outputs: [],
    txs: []
  };

  for (let i = 0; i <= height; i++) {
    const block = await client.getBlock(i);

    for (const txn of block.txs) {
      let match = false;

      const tx = TX.decode(Buffer.from(txn.hex, 'hex'));

      for (const [i, output] of tx.outputs.entries()) {
        const {covenant} = output;
        if (covenant.isName()) {
          const hash = covenant.getHash(0);
          if (nameHash.equals(hash)) {
            match = true;

            out.outputs.push({
              outpoint: {hash: tx.txid(), index: i},
              output
            });
          }
        }
      }

      if (match)
        out.txs.push(tx);
    }
  }

  console.log(JSON.stringify(out, null, 2));

})().catch(err => {
  console.log(err);
  process.exit(1);
});