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Keno Provably Fair Verifier

Recompute the 10 drawn Keno numbers from your revealed seeds — tested against Stake.us' own calculator.

Server seed (revealed / unhashed) Client seed Hashed server seed (optional — shown before you played)

Nonce

Computed locally via the Web Crypto API (HMAC-SHA256). Your seeds and nonce are never sent anywhere — the only network request on this page is an anonymous, cookieless page-view counter (page path + referring page, nothing you type). 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?

It is tested against Stake / Stake.us. Other casinos match only if they use exactly Stake's Keno algorithm — not tested by us.

Formula checked bit-for-bit against Stake.us' own calculator (Aug 2026). Other casinos not tested. Other games: Dice · Limbo · Plinko · Mines · Keno · all verifiers. Open methodology: /methodology/. © FairPlay Audit — independent, free and open source (MIT).