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 (2026-05-31T21:21:06.186Z).

ef1f8615cdb0f198e5a501f6c3d5fe1d257c3f712b4e62c4b93cc8e78062e4c6

2. Reveal (server_seed)

Revealed after draw (2026-06-01T00:04:23.147Z).

fa3e9b474d282840a8164d2f6f1d3dd8f6cf2661531e5238892c1336bc66bb73

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

3. Client seed inputs (all sold eggs)

#	Wallet	Winner?
1	4vdwQd...KDfW
2	77KYS5...Y2vM
3	B5MHQQ...xyP3
4	6JwQFt...s1Rg
5	CyLwMe...zQZ8
6	EzfMVi...2QC6
7	43y2Hn...8yuJ
8	9UU1p3...teVt	🎉
9	GLZh4h...Vamj
10	did:pr...ypmv

4. Derived client_seed

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

fcd15d593e9464fb4149699199c8dae78560f74b0aa85d79837d7097df5f4231

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 ( 2026-05-31T21:21:06.186Z). Any Bitcoin block mined after the commit works — we take the tip at draw time.

sourcemempool.spaceheight951,913hash00000000000000000000d40f10282220ab5904b995daf315010f1c47f8eb32a2block time2026-05-31T23:37:57.000Z

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 = 85c628a3fc583cdf1b97cb52430641b6325dfb63da3aa38cd9750df3d506d711

Computed index: 7 → winning egg: #8

7. Independent verification

Show JS snippet (paste into DevTools)

const seed = "fa3e9b474d282840a8164d2f6f1d3dd8f6cf2661531e5238892c1336bc66bb73";
const hashStr = "ef1f8615cdb0f198e5a501f6c3d5fe1d257c3f712b4e62c4b93cc8e78062e4c6";
const clientSeed = "fcd15d593e9464fb4149699199c8dae78560f74b0aa85d79837d7097df5f4231";
const lottoId = "372d6974-f21d-4cfa-961b-56c9c92f694e";
const sold = 10;
const entropy = "mempool.space:951913:00000000000000000000d40f10282220ab5904b995daf315010f1c47f8eb32a2";

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();