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 (2026-05-30T19:53:19.938Z).

70fb61dfe348e6f52a725a6be5c383e9eb4bc1bc3667bf11c843a8fffd261c2b

2. Reveal (server_seed)

Revealed after draw (2026-05-30T22:43:07.506Z).

b0bb059edd14b68e27e339518d9b8e2e564787d5ca48d33955eab7fce65ed989

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

3. Client seed inputs (all sold eggs)

#	Wallet	Winner?
1	A3nRd6...Fbvt
2	AeQZ2G...ee2f
3	7MvYxZ...1dXP
4	71dfGd...SS6g
5	8x4sSX...Tt9Q
6	did:pr...mmq2
7	34HCCG...q8Xm
8	AqCfXY...fEwZ
9	CjkpzR...cV6q
10	B9g8Cu...NiEn
11	DPvMXQ...quty
12	6Ucamk...eXtQ	🎉
13	JBstPD...Zir9
14	E1VVNK...Ba9E
15	4YKVpG...Aokb
16	HnnL3K...zJUJ
17	5WKJVZ...J4E3
18	6fTqFr...7u9i
19	6vy6Cb...43c5
20	98V4U3...nULW

4. Derived client_seed

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

450e48994f4a8bbf5fb1df00ad1f3ed836f81f4454decd8f971b46c7109044db

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 ( 2026-05-30T19:53:19.938Z). Any Bitcoin block mined after the commit works — we take the tip at draw time.

sourcemempool.spaceheight951,762hash0000000000000000000093aa4b2df42819acb3e7004991133715364176a722b7block time2026-05-30T22:34:06.000Z

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 = 12a8481e442e4c53099030f4f7c841306eb92ad91cb618cc93f9c8120bfe7176

Computed index: 11 → winning egg: #12

7. Independent verification

Show JS snippet (paste into DevTools)

const seed = "b0bb059edd14b68e27e339518d9b8e2e564787d5ca48d33955eab7fce65ed989";
const hashStr = "70fb61dfe348e6f52a725a6be5c383e9eb4bc1bc3667bf11c843a8fffd261c2b";
const clientSeed = "450e48994f4a8bbf5fb1df00ad1f3ed836f81f4454decd8f971b46c7109044db";
const lottoId = "1cdf54c2-162e-4d34-ac42-1ed217d3dd9e";
const sold = 20;
const entropy = "mempool.space:951762:0000000000000000000093aa4b2df42819acb3e7004991133715364176a722b7";

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();