ttd_rate.mjs

import {execSync} from "node:child_process";

// Usage
// ```
// node ttd.mjs https://rpc.eu-central-2.gateway.fm/v3/gnosis/archival/chiado
// ```

const rpcUrl = process.argv[2] ?? "https://rpc.gnosischain.com/";
const blocksPerDay = 17280;

let prevBlock = fetchBlock("latest");
const latestBlockNum = parseInt(prevBlock.number);

for (let num = latestBlockNum - blocksPerDay; num > 0; num -= blocksPerDay) {
  const block = fetchBlock(num);
  const tdDiff = BigInt(prevBlock.totalDifficulty) - BigInt(block.totalDifficulty);
  const secDiff = parseInt(prevBlock.timestamp) - parseInt(block.timestamp);
  const numDiff = parseInt(prevBlock.number) - parseInt(block.number);
  const tdPerBlock = tdDiff / BigInt(numDiff);
  const tdPerSec = tdDiff / BigInt(secDiff);
  const secPerBlock = secDiff / numDiff;
  console.log(`Blocks ${parseInt(prevBlock.number)} ${parseInt(block.number)}: tdPerBlock ${tdPerBlock} tdPerSec ${tdPerSec} secPerBlock ${secPerBlock}`);
  prevBlock = block;
}

// number: '0x1786dd7'
// timestamp: '0x63514d94',
// totalDifficulty: '0x1786dd6ffffffffffffffffffffffffeaac82a5',
function fetchBlock(blockRef) {
  const txt = execSync(`curl -s -X POST --data '{"jsonrpc":"2.0","method":"eth_getBlockByNumber","params":["${blockRef}"],"id":0}' ${rpcUrl}`, {encoding: "utf8"});
  const json = JSON.parse(txt);
  if (!json.result) throw Error(txt);
  return json.result;
}