We commit to the next server seed first. You then choose your client seed and activate, which reveals the current server seed.
Next server seed hash
Save this hash before activating — after activation you can check the revealed server seed against it.
Last revealed server seed
How provably fair works
Every result is decided the instant you bet, from a server seed committed before you played — the outcome can't be changed after your bet is in.
The server generates a secret server seed and shows you its SHA-256 hash (the commitment) up front.
Each bet also mixes in your client seed and a nonce that increases by one every round.
The crash multiplier is derived deterministically from server seed + client seed + nonce, so the same inputs always produce the same result.
Activating a new pair reveals the old server seed — re-hashing its raw bytes must match the commitment you saw earlier, proving it was fixed in advance.