Verify it yourself

Did the casino change the seed?

A provably-fair casino commits to a hidden server seed before you bet by showing you its SHA-256 hash. After your bets, it reveals the seed. Paste both here: if the hash of the revealed seed matches the one you were shown, the casino did not swap it mid-session. If it doesn't match, walk away.

This is the one check that works at every provably-fair casino, because the seed-commitment step is universal. How the seed then maps to a specific game result varies by casino — use the tool below for the most common scheme.

Recompute a game outcome

Most dice, crash and roulette-style games derive each result from HMAC-SHA256(server seed, client seed:nonce). Enter the three values and this reproduces the raw result the casino should have used. Compare it to what you were shown.

The exact mapping from hash to result differs between casinos and game types (some use a cursor, extra rounds, or a different message format). If your numbers don't match, check the casino's published fairness method — a difference isn't automatically proof of cheating, but a casino that won't publish its method is a red flag.

What a bonus really costs you

Deposit-match bonuses come with wagering requirements — you have to bet the bonus (and sometimes the deposit) many times over before you can withdraw. This shows the total you must wager and the average amount it costs you to clear.

What the house keeps over time

Return-to-player (RTP) is the share of wagers a game pays back on average over the long run. The rest is the house edge. Enter a game's RTP and how much you plan to bet to see the expected long-run cost.

This is a long-run average, not a prediction for any single session — real results swing widely around it. A fair game still has a house edge; over enough bets, the house wins. Only play with money you can afford to lose.