Provably-fair verifier
Updated:
Recalculate any Stake bet from its seeds using the public HMAC-SHA256 algorithm. Everything runs locally in your browser — your seeds are never sent anywhere.
Verifier FAQ
How does provably-fair verification work?
Each bet result comes from three inputs: a server seed (committed as a hash before play), your client seed, and a nonce. After you rotate seeds, the server seed is revealed and the result is reproduced with HMAC-SHA256(serverSeed, clientSeed:nonce:round) → bytes → float → outcome. If it matches the casino, the bet was fair.
Are my seeds sent anywhere?
No. This tool computes everything in your browser using the Web Crypto API. Nothing leaves your device.
Which casinos does it support?
Stake.com and Stake.us, plus any casino using the same standard HMAC-SHA256 method (Shuffle, BC.Game, Roobet and others).
18+ · Informational tool. Provably-fair outcomes are cryptographically random and cannot be predicted.