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 (2026-05-31T19:34:56.138Z).

1a966eabfdb250f1f6f730ec84a74c8ec82858ab3a31b847c7b899752897adfd

2. Reveal (server_seed)

Revealed after draw (2026-05-31T19:50:10.037Z).

cf0277d7a4684335af5c5a3360ee248c7313a069854f68ed871e0beaf6c527b3

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

3. Client seed inputs (all sold eggs)

#	Wallet	Winner?
1	2ird6n...86mv
2	D2mrbs...2VPQ
3	3YBqQc...qsXu
4	2wHMMg...HiGw
5	B5ywNJ...iHwX
6	HpwH4R...51xh
7	4UVZsH...RXQH
8	43y2Hn...8yuJ
9	GLZh4h...Vamj	🎉
10	CoVhCT...D6Cn

4. Derived client_seed

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

7861f35f48250d49b74f19b154ef353c781e53009f0304d1ffbc2e1639994974

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 ( 2026-05-31T19:34:56.138Z). Any Bitcoin block mined after the commit works — we take the tip at draw time.

sourcemempool.spaceheight951,887hash000000000000000000000ea29810cd6f6c1e048b71f4a65dc9159ff57fff00cbblock time2026-05-31T19:42:14.000Z

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 = 5a525d13df01541a209bf90f85595828272b38ec911e4628f63ff68154249189

Computed index: 8 → winning egg: #9

7. Independent verification

Show JS snippet (paste into DevTools)

const seed = "cf0277d7a4684335af5c5a3360ee248c7313a069854f68ed871e0beaf6c527b3";
const hashStr = "1a966eabfdb250f1f6f730ec84a74c8ec82858ab3a31b847c7b899752897adfd";
const clientSeed = "7861f35f48250d49b74f19b154ef353c781e53009f0304d1ffbc2e1639994974";
const lottoId = "a37e2d96-0c78-4b27-b0ae-9c4ac3181193";
const sold = 10;
const entropy = "mempool.space:951887:000000000000000000000ea29810cd6f6c1e048b71f4a65dc9159ff57fff00cb";

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();