Capture the commitment
Save the pre-play server-seed hash, client seed, nonce and game version before rotating anything.
This page is a decision worksheet built around a specific search task. It separates observable records, first-party wording and unresolved claims so the conclusion can be checked again after a material change.
Freeze the round record
Record bet ID, wager, outcome, timestamp and the exact formula or verifier version.
Reveal and hash the seed
After rotation, confirm the revealed server seed matches the earlier commitment.
Recalculate independently
Use documented encoding, HMAC or hash steps and map the resulting number through the stated game rules.
Define claim boundaries
State what the test proves about that round and what remains outside it, including custody and payment behaviour.
Cryptographic reproducibility is narrower than trust
A correct seed calculation can coexist with poor limits, misleading terms or withdrawal problems. Score round integrity and operator conduct separately.
Questions this page resolves
Can I verify a round before the server seed is revealed?
You can save the commitment, but full recalculation normally requires the later reveal.
Does provably fair mean the game has a good RTP?
No. Fair reproduction and the game’s expected return are different properties.
What should I save if the verifier changes?
Keep seed inputs, nonce, bet record, formula version and an independent calculation.