Server commits first
The server generates a secret seed and shows you its hash in advance. So you can't know the result beforehand, and we can't change it afterwards.
Cryptographic game integrity
Trust the proof, not the promise.
Every NeonBet Originals round begins with a server-seed commitment. After the seed is revealed, you can reproduce the same raw result in your browser and confirm that nothing changed.
Seed committed before play
Same inputs reproduce the same result
Calculation stays in your browser
Verification lab
Check the math yourself
Use the exact values from a completed round. NeonBet does not receive the seeds you enter here.
Recreate the HMAC-SHA256 signature and raw result for any revealed round.
Hash the revealed server seed and compare it with the commitment published before play.
Commit, play, reveal
How does Provably-Fair work?
Every game result is locked in beforehand, before you play, and cannot be changed afterward. Three parts combine:
You add your seed
You set your own seed: you also influence the outcome.
Reveal and verify
When you rotate your seed, the old server seed is revealed; match it with its hash and verify all your past rounds yourself.
HMAC-SHA256
The same inputs always create the same 256-bit signature. The first 52 bits are converted into a raw number between 0 and 1.
signature = HMAC-SHA256(serverSeed, clientSeed + ":" + nonce)
float = hex[0..13] ÷ 252
float = hex[0..13] ÷ 252
Know what you are checking
- server seed
- A secret random value generated by NeonBet and committed in advance through its hash.
- Client seed
- A value you control. It prevents the server from being the only contributor to the result.
- Nonce
- A counter that increases for each round, making every result unique under the same seed pair.
- Recorded hash
- The SHA-256 fingerprint published before play. It proves the server seed was not replaced later.
NeonBet Originals
Published RTPs
RTP is a long-term theoretical rate, not a promise for an individual session.
Short-term results can be above or below these rates because of variance. Provider games use their provider’s own fairness and RTP documentation.
Clear answers
Before you verify
Can I predict the next result?
No. The active server seed remains secret. Its hash proves commitment without revealing the seed needed to calculate future results.
When is the server seed revealed?
The previous server seed is revealed when you rotate the seed pair. You can then verify every round played with that pair.
Does this verifier send my seeds anywhere?
No. The calculation uses the browser Web Crypto API and runs locally on your device.
Does this cover external provider games?
This calculator matches NeonBet Originals. External providers may use different algorithms and publish separate verification or certification documents.