Provably Fair Verifier

How to use this provably fair verifier

This provably fair verifier recomputes a finished original from the seeds on the Fair tab. Pick the casino and the game, paste the revealed server seed, the hash if you have it, then the client seed and nonce.

If you also copied the hash shown before you played, paste it. The tool SHA-256s the revealed server seed and checks that fingerprint. A match means this secret is the one they locked in. It does not by itself prove the game result.

What provably fair actually checks

Before you play, the casino publishes a hash of a secret server seed. After you rotate, they reveal that seed. SHA-256 of the revealed seed must equal the hash you were shown. That is the commitment check. It is the same idea on every brand.

The result on screen is a second step. The casino maps that seed, plus your client seed and a nonce, through a published formula. Dice, mines, crash and cards do not share one formula. Two casinos can both say HMAC-SHA256 and still land on different numbers.

A green box on this page means the seeds you pasted follow the recipe selected in the menu. It does not mean the casino is safe, the edge is kind, or the next bet wins.

What this tool computes today

Pick the casino and the game that match the Fair tab you copied from. A hash match means this revealed seed is the one they locked in. The result card is the recipe for that menu pair only. Compare it with the casino screen. A match is not a safe casino and it is not a forecast.

Worked path

Rotate seeds on the casino so the server seed is revealed. Paste the hex seed and the hash from before play. The SHA-256 card must match that hash. Then pick the game you actually played. For Duel Dice, also paste client seed and nonce. For Duel Crash or Castle Roulette, paste the drand seed instead. Compare the result card with the casino screen.

Provably fair verifier FAQ

Can I verify every casino here?

Not yet. Add the casino in the menu first. Each brand publishes its own mapping. Using the wrong mapping prints a confident wrong number.

Does a hash match mean the seed is legit?

It means the revealed server seed is the preimage of the hash they showed you before play. It does not prove the dice roll, the crash point, or the card order.

Does this verify Duel Crash?

Yes. Duel Crash uses a server seed plus a drand seed. Stake Crash and other crash games are not the same recipe.

Does this work for Rollbit?

Not for the game result. Rollbit originals use VRF proofs. Open Rollbit’s own fair panel.

The status box says my seed does not match. Is the casino rigged?

Not from that alone. Wrong nonce, a still-hashed server seed, the wrong game, or a brand that is not in this menu will all miss.

Do you keep my seeds?

No. The script runs in your browser.

Is this a bet?

No. 18+ only. Not financial advice.

Should I paste a server seed that is still active?

No. Rotate first. An active server seed is still making new rounds. This page only checks a revealed seed.

Does this work for every casino?

Only for the casino and game you pick in the menus. Each brand maps seeds differently. The wrong casino in the list still prints a number. That number will not match the other brand’s screen.

Where do I find the seeds?

Open the original, open Fair or seeds, rotate so the previous server seed is revealed. Copy that seed, the hash from before play, then client seed and nonce. Some games use a public randomness field instead of a client seed. Use the fields the selected game shows.

More tools: /how-provably-fair-works, /house-edge-calculator, /odds-converter, /parlay-calculator, /bonus-wagering-calculator.