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 (2026-05-31T05:49:13.522Z).

5c6ffe14750f8673ebb18141687d6b6156e25daa70074b423fbde8eaa1fa459a

2. Reveal (server_seed)

Revealed after draw (2026-05-31T18:18:06.594Z).

b91767c1281cd35e44bcddc12a3f270eeda8a3717fd87bd0c58527c2a94987d0

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

3. Client seed inputs (all sold eggs)

#	Wallet	Winner?
1	3XuN7X...aiMT
2	9hj7jn...p66e
3	BsCuxX...F9UY
4	9XeqfN...M4k6
5	ELCrwG...rELy
6	ARVJ9G...icGE
7	Es5494...p7bs
8	98nEKr...vxCb	🎉
9	7iZqye...Rf2A
10	E5vC3a...XFPg

4. Derived client_seed

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

6ee5172f33443d845dd942412cd4597f0af170c59bbe1faa22a9f96e946338f6

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 ( 2026-05-31T05:49:13.522Z). Any Bitcoin block mined after the commit works — we take the tip at draw time.

sourcemempool.spaceheight951,882hash0000000000000000000170cd3c2bc63e19028f091d57e6903a7983db17a0aa60block time2026-05-31T18:06:24.000Z

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 = a18f07a2dc40bf13ba2c78bc24ec8227008936625c36172d442edab5d6248c7c

Computed index: 7 → winning egg: #8

7. Independent verification

Show JS snippet (paste into DevTools)

const seed = "b91767c1281cd35e44bcddc12a3f270eeda8a3717fd87bd0c58527c2a94987d0";
const hashStr = "5c6ffe14750f8673ebb18141687d6b6156e25daa70074b423fbde8eaa1fa459a";
const clientSeed = "6ee5172f33443d845dd942412cd4597f0af170c59bbe1faa22a9f96e946338f6";
const lottoId = "c56b0fd4-c3ed-48aa-817b-c8be31280968";
const sold = 10;
const entropy = "mempool.space:951882:0000000000000000000170cd3c2bc63e19028f091d57e6903a7983db17a0aa60";

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();