Finds block with the highest reward

rewards.js

#!/usr/bin/env node

// Create a directory with the script inside, then run npm init && npm i node-bitcoin-rpc
// Run it with ./rewards.js or node rewards.js
// Also change the username and password below
// As of 20 Jul 2021, it is block 409008, with 316,53275103 BTC
// Honourable mentions: block 254642, with 225,22600217 BTC
// And block 157235, with 221,84649523 BTC

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

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

errorHeights = [];

async function getBestBlock() {
  return new Promise(resolve => {
    rpc.call("getblockchaininfo", [], (e, d) => {
      if (d.result) {
        resolve(d.result.headers);
      } else {
        console.error(e);
      }
    })
  });
}

async function getBlockStats(height) {
  return new Promise(resolve => {
    rpc.call("getblockstats", [height], (e, d) => {
      if (!d) {
        errorHeights.push(height);
        resolve(0);
      } else {
        resolve(d.result);
      }
    });
  });
}

async function findHighestReward(cb) {
  const initialBlock = 1;
  var bestBlock = await getBestBlock();
  var highFeeBlock = {
    height: 0,
    reward: 0
  };

  console.log(`Best block: ${bestBlock}`);
  console.log("=============================\n");
  var newBestRewardFound = false;
  for (var i = initialBlock; i <= bestBlock; i++) {
    var block = await getBlockStats(i);
    var reward = block.subsidy + block.totalfee;

    if (reward > highFeeBlock.reward) {
      newBestRewardFound = true;
      highFeeBlock.reward = reward;
      highFeeBlock.height = i;
    }

    if (i % 50 == 0) {
      if (newBestRewardFound) {
        console.log(`Block ${block.height} of ${bestBlock}. New highest: ${highFeeBlock.reward} sats at height ${highFeeBlock.height}`);
      } else {
        console.log(`Block ${block.height} of ${bestBlock}`);
      }
      newBestRewardFound = false;
    }
  }

  console.log("Highest reward block:");
  console.log(highFeeBlock);

  var rewardStr = (highFeeBlock.reward / 100000000).toString().replace(".", ",");
  console.log(`${formatNumber(highFeeBlock.reward)} sats`);
  console.log(`${rewardStr} BTC`);

  console.log("\n\nProblematic heights:");
  console.log(errorHeights);
}

function formatNumber(num) {
  return num.toString().replace(/(\d)(?=(\d{3})+(?!\d))/g, '$1.')
}

findHighestReward();