✅ How to verify any Doodly round yourself, step by step

Reading about provable fairness is useful. Actually verifying one of your own rounds is what turns it from a marketing phrase into something you have personally confirmed. It takes about two minutes.

1. Record the commitment

Open your fairness settings and copy the active server seed hash. Save it somewhere outside the site — a note, a message to yourself, anywhere you control. This is the commitment the platform is bound to, and having your own copy means it cannot be quietly rewritten later.

2. Set a client seed you chose

Replace the default client seed with something of your own. It does not need to be random or clever — a word, a date, anything. What matters is that the platform did not pick it, which is what makes precomputation impossible.

3. Play and note the nonce

Open a box or play a round. Each round records the nonce it used. You can verify a single round or every round from that seed pair; the nonce is what distinguishes them.

4. Rotate to reveal

5. Check the hash

Take the revealed server seed and compute its SHA-256 hash. The verifier does this for you, or you can use any offline SHA-256 tool if you would rather not take the site's word for it. The result must match the hash you saved in step one, character for character.

6. Reproduce the outcome

1. 1Enter the revealed server seed.
2. 2Enter the exact client seed that was active for the round.
3. 3Enter the nonce for that round.
4. 4The verifier computes HMAC-SHA256 and shows the resulting number and the prize it maps to.

If the prize shown by the verifier is the prize you received, the round was honest. Repeat with any other nonce from the same seed pair — the whole session can be audited in a couple of minutes.

What to do if something does not match

Keep your saved hash, the seeds, the nonce and a screenshot of the result. Send them to support. A mismatch is not a difference of opinion — it is arithmetic, and it either matches or it does not.