Spinanigans › Learn › Provably Fair Games Explained
A provably fair game uses cryptography so you can check, after a round, that the result was fixed before you bet and was not changed.
Before play, the casino commits to a secret server seed by showing you its hash, a fingerprint that cannot be reversed. You add your own client seed. Each round combines the two seeds with a counter (a nonce) to produce the result through a fixed formula. When the server seed is later revealed, you can hash it, compare it to the earlier fingerprint, and recompute every result yourself.
It proves a specific result was produced by the committed seeds and was not altered afterwards. It does not prove the game is a good bet, because the house edge (the RTP) is part of the published rules. It also says nothing about whether the casino pays withdrawals promptly. Read the casino's terms and reputation separately.
Jewel Clicker: Rockageddon, TAPinata, Turbo Keno. Provably fair mechanics also apply to some crash games.
Not necessarily. Provably fair is about verifying results, not about the RTP, which still includes a house edge.
Use the casino's built-in verifier or a public tool: enter the revealed server seed, your client seed and the nonce, and check the output matches the round.
No. Many slots from big studios are tested by independent labs but are not provably fair. The label mostly appears on in-house and instant games.
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