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Provably fair games explained

Many crypto casino games call themselves provably fair: you can check after a round that the result was fixed before you bet and not changed. Here is how that works, and what it does not promise.

On this page
  1. The three ingredients
  2. How to check a round
  3. What provably fair does not prove
  4. Questions about provably fair

The three ingredients

  1. Server seedA secret random value from the site. Before the round, the site shows you only its hash, a fingerprint that cannot be reversed.
  2. Client seedA value from your side. You can usually change it in the game settings.
  3. NonceA counter that goes up by one with each bet, so every round uses a new combination.

The game combines the three to produce the result. Later the site reveals the server seed. You hash it yourself: if the hash matches the one shown before, the seed was not swapped mid-game.

How to check a round

  1. Note the hashed server seed before you playIt is shown in the fairness or seeds panel.
  2. Rotate the seed after playingThe site then reveals the old server seed.
  3. Run the checkUse the site's verifier, or an independent one, with the server seed, your client seed and the nonce of the bet.
  4. CompareThe result must match what happened in the game, and the revealed seed's hash must match the one you noted.

What provably fair does not prove

  • It does not remove the house edge. A dice game with a 1% edge is fairly random and still costs you 1% of your stakes on average.
  • It does not cover live dealer or most slots. Those use certified random number generators or real tables instead.
  • It does not make the site pay. A fair game at a site that refuses withdrawals is still a bad deal.
  • Only if you check. If nobody looks at the seeds, a dishonest site could still show fake ones. Checking a few rounds now and then keeps it honest.

Questions about provably fair

Are all crypto casino games provably fair?

No. Mostly the in-house games: dice, crash, plinko, mines. Slots from big studios and live tables use other methods.

Can a provably fair game be rigged?

Not without the check showing it, as long as you note the hash before playing and verify after.

Does provably fair mean I can win in the long run?

No. The result is fair, the payout table still keeps an edge for the house.

Where do I find the seeds?

In the game's fairness or settings panel. If a game claims to be provably fair and shows no seeds, treat the claim as marketing.