How Provably Fair Works
Before each game round, the casino creates a server seed (hidden) and shares its encrypted hash with you. You provide a client seed. The game outcome is determined by combining both seeds with a nonce. After the round, you can reveal the server seed and independently verify the hash matches, proving the result wasn't changed after your bet.
The Verification Process
- Casino generates a server seed and shares its SHA-256 hash
- You set or receive a client seed
- The bet is placed and the outcome calculated using both seeds + nonce
- After the bet, you can reveal the server seed
- Hash the revealed server seed — if it matches the pre-bet hash, the game was fair
- Recalculate the outcome using the seeds to confirm the result
Games That Use Provably Fair
Provably fair technology is most common in crypto casino original games: Dice, Crash (Aviator-style), Plinko, Mines, Limbo, Keno, and Hilo. Some casinos extend it to virtual slots, though traditional slots from providers like Pragmatic Play and NetEnt use standard RNG with third-party auditing instead.
Why It Matters for Players
- Complete transparency — no need to trust the casino blindly
- Mathematical proof, not just a claim of fairness
- Protection against result manipulation
- Builds trust between players and crypto casinos
- Complements (doesn't replace) regulatory oversight
Frequently Asked Questions
Written by
Sarah van der Merwe
Casino & Betting Experts
Sarah covers blockchain technology and its applications in online gambling for the SA market.