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PrincePickles, the DuelVerdict cat, with a paw on a glowing green check coin beside a glowing die

Provably fair on Duel

Can Duel rig your bet?
Check it yourself.

Duel’s Originals use a provably fair system. The game locks its secret seed before you play, then reveals it after the round so you can verify the result and see whether it matches.

By PrincePickles · Updated

Read the 30-second answer

The 30-second answer

Before you bet, Duel commits to a server seed and shows its hash, along with your client seed and a bet counter. When you rotate the seeds, Duel reveals the old server seed. You can then run the result through the verifier to check that it matches.

A matching result does not establish that every description of the odds is accurate. The published return and the verification of a completed round need separate checks.

  1. 1. Hash shown
    before play
  2. 2. Play round(uses server seed,
    client seed + nonce)
  3. 3. Reveal
    server seed
  4. 4. Verify
    the result

How I would check a bet on Duel

The seeds, nonce and round number shown are illustrative.

  1. Open the fairness settings

    Note the server seed hash, your client seed and the current nonce before you play.

  2. Play the round

    On Mines (or Keno), the board is fixed by the seeds before you make your picks.

  3. Rotate the seeds

    Duel reveals the old server seed. That revealed seed should match the hash it committed to before the round.

  4. Run the verifier

    Put the old server seed, client seed and nonce into Duel’s verifier. If the result matches the round you played, that’s the check.

What a check actually looks like

It’s not about predicting the next tile. It’s about taking a finished round and recreating it from the inputs that were committed before play.

View an example check

The three inputs, in plain English

Server seed
Duel’s sealed envelope. Shown as a hash first, then revealed after the round.
Client seed
A value you set. It’s another input mixed into the round.
Nonce
A counter that distinguishes rounds made with the same seed pair.

What I can check, and what I can’t

I care about two separate questions here: what the game is designed to return, and whether a completed result follows the committed inputs. The advertised 100% RTP answers the first. A correctly implemented and checked seed system addresses the second. One claim cannot do the other’s job.

A matching round would not establish that a casino can pay every withdrawal, that its support resolves disputes, or that a game was described honestly. I would rather have that check available than rely on the word “fair” alone.

Explore Duel Originals Who owns Duel?

100%RTPDuel Originals

Same inputs. Same result.

With the revealed inputs and the correct algorithm, the same round should reproduce the same result. I have not published a completed verification of one of my own bets here; the walkthrough is illustrative.

Frequently asked questions

Can I predict the next result?
No. The useful check happens after the round, when the old server seed is revealed.
Does it cover every game?
No. This provably fair check applies to Duel’s own Originals, not third-party studio slots.
What about Crash?
Crash uses a public, transparent mechanism instead of your client seed, and its nonce is fixed at zero, so you can check it with Crash’s own method.

What I would need to call this a completed test

I would need the commitment saved before play, the revealed server seed, my client seed and nonce, and a reproduced outcome matching the recorded bet. Until those are attached, an example verifier screen is an explanation, not proof that I ran that test.

Check a bet on Duel