Recompute any Roulette round from the revealed server seed, your client seed and the nonce. House edge: 2.70% (single zero).
One float mapped onto 0–36 picks the pocket. Single-zero layout, so every straight-up number has a true 1/37 chance while paying 35:1 — the classic 2.7% edge.
The committed float decides the spin before the ball animation plays; verifying gives you the exact pocket.
Odds and payouts
Red/black, odd/even and dozens all price off the same 37-pocket wheel.
How to verify a roulette round yourself
Rotate or end the seed pair in your account so the casino reveals the server seed it committed to. Until that happens the hash is a promise, not a proof.
Copy the revealed server seed, your client seed and the nonce of the round you want to check — the nonce is the round counter, not a timestamp.
Paste all three into the verifier above. It recomputes the HMAC chain and derives the roulette outcome the same way the operator's server did.
Compare the result with what your bet history shows. A mismatch on any single round is the only evidence of tampering that actually means something.
Check the committed hash too: hash the revealed server seed and confirm it equals the hash the casino published before you played.
Verification proves the result was not changed after you bet. It does not make roulette profitable — the 2.70% (single zero) house edge is applied openly, in the payout table, and it is unaffected by any of this.