← All Provably Fair Verifiers
🔒 100% in your browser · your seeds never leave your device

Keno Provably Fair Verifier

Recompute the 10 drawn Keno numbers from your revealed seeds — Stake, Rainbet, Roobet & more.

Computed locally via the Web Crypto API (HMAC-SHA256) — no server call. Your seeds and nonce never leave your device. It's the same code we test against Stake's own calculator.

We check more than your round. This confirms one Keno result. Whether the generator is fair overall is what our independent RNG audits answer — millions of real rounds against NIST SP 800-22 + PractRand. Anyone can verify a round; almost nobody audits the generator.

How Keno provably fair works

Stake-style Keno draws 10 numbers from a pool of 40 squares. Like Mines, it's a sequential draw without replacement — 10 floats, 10 numbers, in the order they came out.

The result comes from the standard Stake-style byte stream:

HMAC-SHA256( key = server_seed , message = "client_seed:nonce:round" )

The exact Keno formula

Start with the pool 1–40. Draw 10 times, removing each drawn number:

for 10 draws:
  idx = floor( f × numbers_remaining )
  number = pool[idx];  remove it from pool

Stake computes the index 0-based and displays the number +1, which is why the pool runs 1–40.

Frequently asked questions

How are provably-fair Keno numbers drawn?

Ten floats draw ten numbers from the 1–40 pool without replacement: idx = floor(float × numbers remaining), remove, repeat. The result is the draw order.

Is a Keno draw predictable?

No. Until the server seed is revealed the draw is unknowable. This verifier only confirms a past draw.

Why is the pool 40 numbers?

Stake-style Keno uses a 40-square board and draws 10. Other Keno variants may differ, so this tool targets the Stake-style engine.

Does this work across casinos?

Yes — any Stake-style casino using the shared HMAC-SHA256 engine.

Formula verified bit-for-bit against Stake's reference calculator (Aug 2026). Other games: Dice · Limbo · Plinko · Mines · Keno · all verifiers. Open methodology: /methodology/. © FairPlay Audit — independent, free, open-source.