Provably Fair Games Explained

The three ingredients

• Server seed: a secret value from the casino, shown to you only as a hash before you play.
• Client seed: a value you can set or change.
• Nonce: a counter that goes up by one with every bet.

The result of each round is calculated from all three. Because you saw the hash of the server seed first, the casino cannot swap it later without you noticing.

How to check a round

1. Open the fairness panelNote the hashed server seed and your client seed.
2. Rotate the seedThe casino reveals the previous server seed.
3. Hash itCheck that its hash matches the one you were shown.
4. RecalculateUse the casino's verifier, or an independent one, with the seeds and nonce to reproduce the result.

What it does not prove

Provably fair proves that the result was not changed. It does not change the house edge, and it does not apply to live dealer games or to slots from outside studios, which rely on their own testing.

Questions