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Provably fair systems let you check that a result was not changed after you placed a bet. These guides explain server seeds, client seeds, nonces and how to actually run a verification yourself.
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It proves that a result came from a server seed the casino fixed before you bet, combined with your client seed and a nonce, and that nothing was changed afterwards. It does not prove the casino is solvent, that a withdrawal will be paid, or anything about slots and live dealer games.
Duel's own verifier is at duel.com/fairness/verify. Enter the server seed, client seed and nonce of a past round after rotating the seed pair. For an independent check, run the scripts on this page, which reproduce Duel's published worked examples exactly.
Rotate when you want to audit the bets you have just made, because the server seed is only revealed on rotation. A sensible routine is once after your first session and again whenever a result looks wrong. There is no need to rotate on a schedule, and no benefit to doing it often.
A server seed is a secret random value generated by the casino. On Duel.com it is a 64-character hex string. Before you bet you see only its SHA-256 hash, which commits Duel to that seed. The seed itself is revealed when you rotate, so you can confirm it matches the hash and reproduces your past results.
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