Open Account → Game fairness. Note the active server-seed hash and your client seed, and copy the hash somewhere safe.
Play — or note the nonce of an existing round from your history.
Rotate the fairness seed to reveal the old server seed. SHA-256(revealed seed) must equal the commitment you copied. If it does not, stop playing and tell us.
Computationally: block = HMAC-SHA256(revealedSeed, “nightclub:v2:clientSeed:nonce:cursor”). Read each word as unsigned big-endian uint32; discard words at or above 0x100000000 − (0x100000000 mod max) — that is the rejection step that guarantees uniform outcomes — then take word mod max.
Round out by applying the game’s own ranges and rules to that number. If the result you see differs from what you computed, chat with us with the seed pair and nonce.