Mines
Verify any Duel Mines board. Full Fisher-Yates shuffle of [0..gridSize-1] using cursor-indexed HMAC-SHA256 values with rejection sampling; the first N shuffled positions become mines (then sorted for display).
Frequently asked
Is Duel Mines 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 Mines round?⌄
Paste the revealed server seed, your client seed and the bet nonce 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 Mines?⌄
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.