What Is Provably Fair Gambling?
Provably fair is a cryptographic verification system used by crypto casinos to prove that game outcomes were predetermined fairly and not manipulated after the fact. It allows players to independently verify every single bet result.
How Provably Fair Works on Duel
- Server seed generation: Before you bet, Duel's server generates a random seed and gives you its SHA256 hash.
- Client seed: You provide or are assigned a client seed that only you control.
- Outcome calculation: The game result is determined by combining server seed + client seed + nonce.
- Reveal: After the bet, the original server seed is revealed.
- Verification: You hash the revealed seed yourself and confirm it matches the hash given before the bet.
Why Provably Fair Matters
Traditional online casinos use RNG systems certified by third parties, but players cannot verify individual outcomes. Provably fair lets any player verify any bet independently without trusting the casino or any third party.
Provably Fair vs Traditional RNG
| Feature | Provably Fair (Duel) | Traditional RNG |
|---|---|---|
| Player verification | Yes — every bet | No |
| Third-party audit needed | No | Yes |
| Outcome manipulation possible | No (cryptographically impossible) | Possible without audit |
| Transparency level | Maximum | Moderate |