roll a 6-sided die with the blockchain using Ethereum Proof of Stake RANDAO.

randao-roll.js

const Web3 = require("web3");
const BN = Web3.utils.BN;

(async () => {
  const network = "mainnet";
  const web3 = new Web3(
    new Web3.providers.HttpProvider(
      `https://${network}.infura.io/v3/${process.env.INFURA_API_KEY}`
    )
  );

  // Get current block number or use a defined block:
  const number = await web3.eth.getBlockNumber();
  console.log(number);

  // Get block data
  const block = await web3.eth.getBlock(number);

  // The PREVRANDAO, the random mix of the previously confirmed block
  console.log(block.mixHash);

  // Roll a 6-sided die
  const index = BN(block.mixHash).mod(BN(6)).toNumber();
  console.log('Dice Roll:', index + 1);
})();