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Byte-For-Byte Match With Stake’s Published Code

STAKE SEED CHECKER

Stake wrote the provably-fair playbook the rest of the industry copied. Drop in a revealed server seed, your client seed and a bet’s nonce, and this page re-runs Stake’s own published algorithm locally to reproduce the outcome of that exact bet.

Reproduce A Stake Bet

Everything is computed with HMAC-SHA256(server seed, "clientSeed:nonce:cursor") — the construction in Stake’s own fairness documentation, validated here against public test vectors. Comparing casinos side by side? The full verifier covers them all.

Round HMAC (SHA-256, hex)
Click to copy
Recomputed Outcome

Derivation, Step By Step

When Stake launched its Originals, it did something unusual for a casino: it published the maths. The result generator — HMAC-SHA256(server seed, "clientSeed:nonce:cursor") with a documented byte-to-float conversion — is spelled out in Stake’s fairness docs, and open-source ports of it exist that anyone can run. This page is one of those ports, checked against reference test vectors, so the number it prints is the number Stake’s servers were obliged to produce for that seed pair and nonce.

INSIDE STAKE’S FAIRNESS MODAL

Everything you need lives in one place on Stake. Hit your username at the top right, choose Settings, then the Fairness tab. Three values sit there: the client seed (editable — type anything you like), the hashed server seed (Stake’s commitment for the current pair), and the running bet count for the pair. Individual bets also carry their own fairness card: open any bet from your history and its server-seed hash, client seed and nonce are printed on it — that per-bet nonce is the one to type into this checker.

The unhashed server seed only appears once you press Rotate. Rotation retires the current pair, activates a fresh one, and discloses the old server seed in plain text. Until then you hold only its SHA-256 fingerprint — deliberately, since a disclosed seed would let anyone compute future outcomes. Our Stake review covers how the casino has handled fairness over the years.

WHAT A MATCH PROVES

Hash the revealed server seed yourself and it must equal the fingerprint Stake showed before you wagered — that is the commitment. Feed the same seed, your client seed and the bet’s nonce through the algorithm and the outcome must equal what you were paid on — that is the reproduction. Both holding at once means Stake fixed the randomness in advance and could not steer it after seeing your bet, because your client seed entered the mix on your side of the fence.

What it does not prove: that you should expect to win. Every Stake Original carries its stated house edge, and a fair game still grinds it out. The cryptographic background is unpacked in our provably-fair explainer.

Keep Digging

The operator itself: Stake Casino Review 2026

Game-by-game math walkthroughs: Crash · Mines · Dice · Limbo

Operators ranked on this exact test: Best Provably Fair Casinos 2026

STAKE SEED CHECKER FAQ

Yes. The algorithm is published in Stake’s own documentation and independent open-source ports — this page included — reproduce its outputs byte-for-byte. A hash of the server seed is committed before you bet, the client seed is yours, and rotation discloses the seed so history can be audited.
No. Seed pairs belong to an account, and Stake.com and Stake.us are separate sites with separate accounts — each has its own client seed, server seed and nonce counter. The underlying Originals scheme is the same, so this checker handles bets from either, but always pull the seeds from the site where the bet was placed.
Open the bet in your bet history and view its fairness details — the nonce is listed on the bet itself, alongside the client seed and hashed server seed that were active. The Fairness tab under Settings shows the running total for the current pair.
No. Rotation exists purely so the old server seed can be disclosed for auditing. Every pair produces the same uniform distribution, so odds and house edge are identical before and after — rotate as often as you want to verify.
The seed-driven Originals: Crash, Dice, Limbo, Roulette, Mines, Plinko and Keno. Third-party slots and live-dealer tables run on external RNG or physical dealing and sit outside the seed system.