How Provably Fair Works
Traditional casino RNG systems are black boxes — players must trust third-party auditors. Provably fair removes that trust requirement entirely. The mathematics are open, verifiable, and tamper-proof.
🔐 Provably Fair Components
- Server Seed: Random value generated by Duel before the bet
- Server Seed Hash: SHA256 hash of server seed (shared pre-bet)
- Client Seed: Random value provided by/for the player
- Nonce: Incrementing counter for each bet
- Outcome: Calculated from combined seeds + nonce
How to Verify Your Duel Bets
Start a bet on any Duel Original
Before you bet, note the server seed hash shown in the game interface.
Place your bet
The outcome is determined by server seed + client seed + nonce, all combined cryptographically.
Bet resolves
The game reveals the original server seed that was used.
Verify the hash
Hash the revealed server seed with SHA256. It must match the hash shown before the bet.
Confirm the outcome
Use the revealed seeds and nonce to recalculate the game outcome independently. It must match what the game showed.
Provably Fair vs Traditional RNG
| Feature | Provably Fair (Duel) | Traditional Audited RNG |
|---|---|---|
| Player can verify each bet | Yes — instantly | No |
| Requires trust in casino | No | Yes |
| Requires trust in auditor | No | Yes |
| Manipulation detectable | Yes — cryptographically | Only via audit |
| Real-time verification | Yes | No |
| Transparency level | Maximum | Moderate |
Provably Fair FAQ
- Provably fair is a cryptographic verification system that allows players to independently confirm casino game outcomes were not manipulated. Before each bet, the server generates a hashed seed. After the bet resolves, the original seed is revealed for verification.
- After any bet on Duel Originals, you can view the server seed hash (pre-bet), revealed server seed (post-bet), client seed, and nonce. Hash the revealed seed yourself and confirm it matches the pre-bet hash. Use any SHA256 calculator tool.
- Both serve different purposes. Third-party audits verify the overall RNG system periodically. Provably fair allows players to verify every individual bet immediately, without trusting any third party — including the casino itself.
- Mathematically, no. The cryptographic hash commitment (SHA256) is a one-way function — the casino commits to the server seed before the bet via its hash. After the bet, they reveal the seed. If the revealed seed doesn't match the hash, the manipulation is detectable.
- All Duel Originals (Crash, Mines, Plinko, Dice, Blackjack, Roulette) are provably fair. Third-party slots and live casino games use certified RNG systems from licensed providers, which is a different but still audited system.