Provably fair

Provably fair is a cryptographic scheme used by some crypto-casino originals (Crash, Mines, Plinko, Dice) that lets the player independently verify the fairness of each game round. The mechanism: server commits to a hashed seed before the round, player adds a client seed, after the round the server reveals the original seed and you can re-compute the outcome to confirm it wasn't altered.

Provably fair is stronger than RNG certification because the audit is per-round, not per-implementation. Limitation: it only applies to in-house originals that publish the verification algorithm. Third-party slots from studios like Pragmatic Play or Hacksaw don't run on provably-fair — they fall back to standard RNG audits.