Provably-fair proof

This page reproduces the winner computation from public inputs. You can recompute every step in your browser's DevTools — don't trust our math, verify it.

1. Pre-commit (server_seed_hash)

Published when the draw went live (2026-05-31T18:14:59.214Z).

ab2b7e559bc03787e3e5c64cfeabad5913625285b1b4e2c8a467f1e1d70a571e

2. Reveal (server_seed)

Revealed after draw (2026-05-31T18:38:58.624Z).

68b0d688a3fdbc7516b57f9137c00acd7bb069e7ef7ac1d780ba0c118253d74c

Hash check: ✓ sha256(server_seed) === published hash

3. Client seed inputs (all sold eggs)

#	Wallet	Winner?
1	7Y8vNk...Ddyt
2	BEAq6S...fLtK
3	FKxqub...jr8Q
4	B5ywNJ...iHwX
5	3TDBsG...ovyE
6	98nEKr...vxCb
7	3XuN7X...aiMT
8	5X1HmH...Zh1e	🎉
9	BQGUce...D2oH
10	ApeP8q...euwV

4. Derived client_seed

client_seed = sha256(sorted by entry_number, joined as "N:wallet" with '|')

7d3c7cb2d26c7329eaccd6254b4ddb1b047eb358dbbca9a575513e0d7316dd42

5. External entropy (Bitcoin block)

Mixed into the HMAC input so the draw depends on a value the operator could not have known when the server seed was committed ( 2026-05-31T18:14:59.214Z). Any Bitcoin block mined after the commit works — we take the tip at draw time.

sourcemempool.spaceheight951,883hash00000000000000000000a9d181fe40ad7ff8044c9dbfe1380c2b9899a2d7d890block time2026-05-31T18:35:10.000Z

Cross-check on mempool.space or blockstream.info.

6. Winner computation

HMAC-SHA256(server_seed, "client_seed:lotto_id:source:height:hash"), first 16 hex chars, mod sold_count (10).

hmac = ad1a34e501212a8de67ff6406447c16858444f98aadd035e1a3a6537e430b21a

Computed index: 7 → winning egg: #8

7. Independent verification

Show JS snippet (paste into DevTools)

const seed = "68b0d688a3fdbc7516b57f9137c00acd7bb069e7ef7ac1d780ba0c118253d74c";
const hashStr = "ab2b7e559bc03787e3e5c64cfeabad5913625285b1b4e2c8a467f1e1d70a571e";
const clientSeed = "7d3c7cb2d26c7329eaccd6254b4ddb1b047eb358dbbca9a575513e0d7316dd42";
const lottoId = "cc914d7b-eca6-4043-8b69-18423f8c3972";
const sold = 10;
const entropy = "mempool.space:951883:00000000000000000000a9d181fe40ad7ff8044c9dbfe1380c2b9899a2d7d890";

async function run() {
  const enc = new TextEncoder();
  const seedBytes = enc.encode(seed);
  const hashed = await crypto.subtle.digest("SHA-256", seedBytes);
  const recomputed = [...new Uint8Array(hashed)]
    .map((b) => b.toString(16).padStart(2, "0")).join("");
  console.log("hashOk:", recomputed === hashStr);

  const key = await crypto.subtle.importKey(
    "raw", seedBytes, { name: "HMAC", hash: "SHA-256" }, false, ["sign"]
  );
  const message = entropy
    ? clientSeed + ":" + lottoId + ":" + entropy
    : clientSeed + ":" + lottoId;
  const sig = await crypto.subtle.sign("HMAC", key, enc.encode(message));
  const hex = [...new Uint8Array(sig)]
    .map((b) => b.toString(16).padStart(2, "0")).join("");
  const idx = Number(BigInt("0x" + hex.slice(0, 16)) % BigInt(sold));
  console.log("hmac:", hex);
  console.log("winnerIndex:", idx);
}
run();