Provably fair

Every result comes from HMAC-SHA256(serverSeed, clientSeed:nonce:cursor). Before you play you see only the hash of the server seed. When you rotate it on your profile, the seed is revealed, so you can recompute every bet you made with it right here, in your browser. Crash and Slide use a chain of SHA-256 hashes generated in advance: each round's hash is the hash of the next one, so no round can be changed once the chain exists.