Duel provably fair verifier

Duel uses HMAC-SHA256, key: server seed bytes (hex), message: clientSeed:nonce or clientSeed:nonce:cursor. That output is then turned into a game result with a formula specific to each game, which is what this verifier recalculates.

Dice, Limbo, Plinko, Mines, Keno and Blackjack / Hilo cards. Crash, Coinflip and Castle Roulette take their public seed from the drand beacon; slots, Cross Road and Video Poker are not covered here.

Formulas from the verification code Duel shows on its own provably fair page. Every game here gives the same results as Duel's own verifier on the same seeds. Plinko buckets are counted from 1, as Duel shows them.

Open the bet in your bet history, or the fairness section of the game. The client seed and the nonce are shown straight away. The server seed is shown only as a hash while it is in use: rotate your seed pair and the casino reveals the unhashed seed for all the bets made with it.

Because the server seed stays secret while it is active, otherwise you could calculate your next results in advance. Rotating retires the seed and reveals it. Finish any game in progress before you rotate.

Check the inputs first: the server seed must be the unhashed one, the client seed must be the one that was active for that bet, and the nonce must be the one of that bet, not the latest one. Check the game settings too, such as the number of mines or rows. If everything is right and it still differs, run the same values in the casino's own verifier and ask their support. This tool is independent and can have mistakes of its own.

No. The calculation uses your browser's built-in cryptography and nothing you type is sent to us or to the casino. A revealed server seed is already retired, so it cannot be used to predict future bets anyway.

It means that result was fixed by the seeds before you bet and was not changed afterwards. It does not remove the house edge, which is built into the payouts, and it says nothing about withdrawals or how the casino treats its players.