README.md

2018 NY Jackpot fairness

Here you can check fairness of edgeless jackpot winner.

You can check it in from this repository source code auto-generated github page https://edgeless-casino.github.io/2018-ny-jackpot or run this code in your computer:

yarn install
yarn run
open http://localhost:3000

Most important code in this repository is in rng.service.js file.

const MersenneTwister = require('mersennetwister');

function getKeySerialNumber(clientSeed, serverSeed, keyCount) {
  clientSeed = clientSeed.replace('0x', '');
  serverSeed = serverSeed.replace('0x', '');
  const clSeedSplitted = clientSeed.match(/.{1,6}/g);
  const srvSeedSplitted = serverSeed.match(/.{1,6}/g);
  const seedsCombined = srvSeedSplitted.concat(clSeedSplitted);
  for (let i = 0; i < seedsCombined.length; i++) {
    seedsCombined[i] = parseInt(seedsCombined[i], 16);
  }
  const mt = new MersenneTwister();
  mt.seedArray(seedsCombined);
  return (mt.int() % (keyCount + 1)) % keyCount;
}

This code snippet generates random number using client seed, server seed and total key count of jackpot participants.

This number then is are used as index to get winning key object from keys array.

All keys are included in json file list-of-keys.json.