Giveaway draw details and verification inputs for independent reproduction.
Deterministic weighted selection using HMAC-SHA256 seeded randomness from SHA256(entries_hash + '|' + beacon_value). Each entry has a weight based on their total giveaway entries earned. Selection uses cumulative weight distribution to ensure fair proportional chances.
Copy and run with Node 18+. Download the entries array separately to avoid cluttering this view.
// Node 18+
const crypto = require('crypto');
function sha256Hex(input) {
return crypto.createHash('sha256').update(input).digest('hex');
}
function deterministicWeightedSelection(weightedEntries, seedHex, winnersCount) {
const winningEntryIds = [];
const usedEntries = new Set();
const seedBytes = Buffer.from(seedHex, 'hex');
for (let i = 0; i < winnersCount && usedEntries.size < weightedEntries.length; i++) {
// Create a new seed for each selection to avoid patterns
const selectionSeed = sha256Hex(seedBytes.toString('hex') + i.toString());
const selectionSeedBytes = Buffer.from(selectionSeed, 'hex');
// Generate deterministic random number (0-1) from seed
const randomBytes = selectionSeedBytes.slice(0, 8);
const randomValue = randomBytes.readBigUInt64BE(0);
const maxBigInt = BigInt('0xFFFFFFFFFFFFFFFF');
const normalizedRandom = Number(randomValue) / Number(maxBigInt);
// Calculate cumulative weights for available entries
const availableEntries = weightedEntries.filter(e => !usedEntries.has(e.uuid));
const availableTotalWeight = availableEntries.reduce((sum, e) => sum + e.weight, 0);
let targetWeight = normalizedRandom * availableTotalWeight;
let cumulativeWeight = 0;
for (const entry of availableEntries) {
cumulativeWeight += entry.weight;
if (targetWeight <= cumulativeWeight) {
winningEntryIds.push(entry.uuid);
usedEntries.add(entry.uuid);
break;
}
}
}
return winningEntryIds;
}
// Load entries from downloaded file
const fs = require('fs');
const entries = JSON.parse(fs.readFileSync('entries.json', 'utf8'));
// Published inputs
const publishedEntriesHash = "5967f6d97bf2e551013e957d5d074f79e8535e58d97773a4ed5681d558b3b5b3";
const beaconValue = "5d139799051bb230d2ed17cc2edbcd70f71264c9b7e7a878d364cbd4573d48e3";
const publishedWinners = ["71b82c36-093e-4db3-bfef-55a56cae596e"];
// 1) Verify entries hash
const entriesHash = sha256Hex(JSON.stringify(entries));
if (entriesHash !== publishedEntriesHash) {
console.error('Entries hash mismatch:', { entriesHash, publishedEntriesHash });
process.exit(1);
}
// 2) Derive seed
const seed = sha256Hex(publishedEntriesHash + '|' + beaconValue);
// 3) Perform weighted selection and compare winners
const winners = deterministicWeightedSelection(entries, seed, publishedWinners.length);
console.log({ winners });
console.log('Matches published:', JSON.stringify(winners) === JSON.stringify(publishedWinners));
Note: We publish opaque entry IDs only. No user handles or PII are exposed.