Rollbit verifier
Crypto casino and trading platform; its dice, plinko and limbo originals follow the HMAC-SHA256 method.
Engine: Stake method (HMAC-SHA256) · established 2020 · 9 verifiable games
Reveal your seed, then recompute
Open the provably-fair or fairness panel in your Rollbit account and rotate your seed pair. This reveals the previous server seed in plain text and shows the SHA-256 hash it was committed to before your bets.
Paste that revealed server seed, your client seed and the nonce of the bet into the form above. Bytes from HMAC-SHA256(serverSeed, `clientSeed:nonce:round`), converted to floats and mapped per game. The server seed is committed as a SHA-256 hash before the bet and revealed when you rotate seeds.
Faircheck hashes your revealed seed to confirm it matches the pre-bet commitment, then reproduces the exact outcome — all locally, so your seeds never leave the page.
Verify a specific game
The 0.00–100.00 roll, recomputed from your seeds.
The crash-style target multiplier, with the house edge exposed.
The single-zero European pocket, 0–36.
The ball’s left/right path and final bin.
Which of the 25 tiles were mines.
The 10 numbers drawn from 40.
The winning segment of the wheel.
The drawn card from a 52-card deck.
The round’s crash multiplier, from the game hash.