Provably fair

Verify a round yourself

Paste the seeds from any round and watch the outcome fall out of them. Nothing you type here leaves your browser, and this page makes no request to us at all — open your network tab and check. Asking us whether a round was fair would prove nothing; this is you doing the arithmetic.

The round

Every game's menu shows these three, and the server seed is revealed once it has been rotated — which is what stops us choosing it after seeing your bet.

Server seed (revealed after rotation)Your seed (client seed)Round number (nonce)

The commitment

Optional, and the part that actually matters. Before you played, the game showed you a hash of the server seed. Paste it here: if it matches, the seed above is the one that was committed to before your bet, and could not have been chosen afterwards.

The arithmetic

Enter a server seed to begin.

Why this is worth more than our word

The seed is committed to as a hash before you bet and revealed afterwards, so we cannot pick it once we have seen your stake. Your own seed goes into the same string, so we cannot pick it without you either. And the arithmetic above is four lines anybody can run — the code on this page uses your browser's own SHA-256, and it matches our engine on every seed we have tested it against.