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 (2026-05-31T18:17:57.276Z).

51f837404de450ac6ac123808bbe8e38a764cf7ae545ac63206f21aa8963b810

2. Reveal (server_seed)

Revealed after draw (2026-05-31T19:16:05.030Z).

6d9afd9f3b38cff7e7b7b47fc11e3b43ba5722f93e108b967c43afe8a604fc7c

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

3. Client seed inputs (all sold eggs)

#	Wallet	Winner?
1	BgecHp...Pk6P
2	BeXDWz...ww2V
3	9UU1p3...teVt
4	kUS5Sy...dovw
5	3TDBsG...ovyE
6	GbmNiL...xp1Y
7	BYqn3m...WNE3
8	7Y8vNk...Ddyt
9	B5ywNJ...iHwX
10	Es5494...p7bs
11	Bao3UY...qPvx
12	98nEKr...vxCb
13	GLZh4h...Vamj
14	BEAq6S...fLtK
15	2jcazK...iEey
16	AQmp7N...Eatz
17	BQGUce...D2oH	🎉
18	ApeP8q...euwV
19	2ird6n...86mv
20	4ZbXXe...uNHz

4. Derived client_seed

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

3d7143ead00b72ea981de6a027607d9c619a53d59cbdbc23c5ffeabda391d1ac

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 ( 2026-05-31T18:17:57.276Z). 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 (20).

hmac = 2b6acdc36825e494ab62c4a5cd3810becaf0c52ce1d3387f688f7fb3f5ac8733

Computed index: 16 → winning egg: #17

7. Independent verification

Show JS snippet (paste into DevTools)

const seed = "6d9afd9f3b38cff7e7b7b47fc11e3b43ba5722f93e108b967c43afe8a604fc7c";
const hashStr = "51f837404de450ac6ac123808bbe8e38a764cf7ae545ac63206f21aa8963b810";
const clientSeed = "3d7143ead00b72ea981de6a027607d9c619a53d59cbdbc23c5ffeabda391d1ac";
const lottoId = "ad75cb32-c854-4419-bffd-1ad8865c65b9";
const sold = 20;
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();