Prints all taproot transactions and their messages at block 709635

first-taproot-txs.js

#! /usr/bin/env node

// Create a directory with the script inside, then run npm init && npm i node-bitcoin-rpc
// Run it with ./first-taproot-txs.js or node first-taproot-txs.js
// Also change the username and password below

const rpc = require("node-bitcoin-rpc")

rpc.init("127.0.0.1", 8332, "rpcuser", "rpcpass");
rpc.setTimeout(Number(process.env.TIMEOUT) || 20000);

async function getTxHashes() {
  return new Promise(resolve => {
    rpc.call("getblock", ["00000000000000000001f9ee4f69cbc75ce61db5178175c2ad021fe1df5bad8f"], (e, d) => {
      if (d && d.result) {
        resolve(d.result["tx"]);
      } else {
        console.error(e);
        resolve([]);
      }
    });
  });
}

async function getTransaction(txHash) {
  return new Promise(resolve => {
    rpc.call("getrawtransaction", [txHash, 1], (e, d) => {
      if (d && d.result) {
        resolve(d.result);
      } else {
        console.error(e);
        resolve({});
      }
    });
  });
}

async function findTaprootTransactions() {
  var txIds = await getTxHashes();
  console.log(`Checking ${txIds.length} transactions...\n`);

  var taprootTxs = [];

  for (id of txIds) {
    var tx = await getTransaction(id);
    for (var input of tx.vin) {
      if (input.coinbase) {
        continue;
      }

      var prevTx = await getTransaction(input.txid);
      var spentOutput = prevTx.vout[input.vout];
      if (spentOutput.scriptPubKey.type === "witness_v1_taproot") {
        var message = "";

        for (var output of tx.vout) {
          var script = output.scriptPubKey;
          if (script.type === "nulldata") {
            message = script.hex.substring(4); // removes op_return and push
            break;
          }
        }

        taprootTxs.push({
          txid: id,
          message: message ? Buffer.from(message, "hex").toString() : "no message"
        });
        break;
      }
    }
  }

  console.log(`Total taproot: ${taprootTxs.length}`);

  for (var obj of taprootTxs) {
    console.log(obj.txid);
    console.log(obj.message);
    console.log();
  }
}

findTaprootTransactions();