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Duel · verificador provably-fair

Crash

Rotar seed ↗

Verify any Duel Crash round. Randomness is a drand beacon "randomness" value (hex-encoded, decoded as UTF-8); HMAC-SHA256(serverSeed, `${randomness}:0`) → first 4 bytes as uint32 → crashPoint = max(1.0, (2^32 / (value + 1)) × 0.999) with a 0.1% house edge.

Identificadores de la ronda

Duel commits to a drand beacon round before the game starts. The revealed randomnesshex value goes here — it's decoded as UTF-8 and used as the HMAC message instead of a client seed + nonce.

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Frequently asked

Is Duel Crash really provably fair?⌄

Yes. Duel publishes a cryptographic commitment (the hash of the server seed) for each round BEFORE you bet. Afterwards the server seed is revealed and anyone can recompute the outcome — which is exactly what the verifier above does. If the computed result matches the shown one, the round wasn't manipulated.

How do I verify a Duel Crash round?⌄

Paste the revealed server seed into the form above. The verifier re-runs the official math and shows you the exact result, step by step. Everything runs in your browser — your seeds never leave the device.

Where do I find my Duel seeds?⌄

On your Duel account's fairness / seed page. There you can rotate the server seed: rotating reveals the old one (so you can verify all your previous bets) and commits a fresh hash for the next ones.

Can Duel cheat on Duel Crash?⌄

Not without getting caught. The server-seed hash is published before the bet, so Duel can't change the seed after the fact — any change would produce a different hash than the committed one. That's what makes the game verifiable.