Crash, dice, mines, and plinko on crypto casinos often carry a provably fair badge. Here is what the badge means and how to check a round yourself.
Provably fair is a method that lets you confirm a game result was fixed before you placed the bet. It uses seeds and a hash. You do not need to trust the casino. You can run the numbers yourself.
The three parts
| Part | Who sets it | What it does |
|---|---|---|
| Server seed | Casino | A secret value. You see only its hash before you play. |
| Client seed | You | Your own value. You can change it at any time. |
| Nonce | Counter | Goes up by one with every bet. |
The game mixes the three values to produce each result. Because the casino shows the hash of its seed before you play, it cannot swap the seed later without the hash changing.
How to check a round
- Open the fairness panel and copy the hashed server seed.
- Set your own client seed.
- Play a few rounds and note the nonce of each one.
- Rotate the seed. The casino now shows the old server seed in plain text.
- Hash the old seed and compare it with the hash you copied.
- Enter the seeds and nonce in a verifier to rebuild each result.
Many casinos have a built in verifier. You can also use an independent one or a short script, as long as it uses the same formula the game publishes.
What it does not prove
- It proves a result was not changed after your bet.
- It does not tell you the house edge. Read the game rules or RTP for that.
- It does not cover payouts, limits, or account reviews.
A fair game still has a house edge. Over many rounds the casino keeps its share. Set a limit before you start.
The original games Alex has tested are listed on the Original Games page. Each game file notes the house edge and how the fairness panel works at that casino.
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Alex writes the house files on Crypto Casino Reviews. He plays the desks he scores and checks the offer, the cashier, and the licence before the long read.