Verify Crash
Crash is multiplayer: one shared multiplier per round, derived from that round’s hash — not from your personal seed and nonce. Faircheck recomputes the exact crash point from the hash the casino published, with the house edge exposed.
The algorithm
Before the round, the casino commits to a hash; when the round ends, that hash (its place in a public hash chain) is revealed.
A 13-hex-digit slice of the hash becomes an integer h, and the crash point is floor((100·2^52 − h) / (2^52 − h)) / 100.
A small fraction of rounds — about the house edge, e.g. 1 in 101 at 1% — instantly busts at 1.00×; that is where the house edge lives.
FAQ
Why a game hash, not a server seed and nonce?
Crash is one shared game for everyone in the round, so it cannot depend on any single player’s client seed. The whole round is fixed by one hash the casino commits to in advance.
My casino uses a salt — what is it?
Some operators HMAC the round hash with a public salt (often a future Bitcoin block hash) before computing the multiplier. Paste it in the optional Salt field; leave it empty otherwise.
Verify Crash on your casino
The math is the same everywhere, but each page is tuned to how that casino reveals its seeds.