Provably fair Hi-Lo verifier

Recompute any Hi-Lo round from the revealed server seed, your client seed and the nonce. House edge: ~1% per step.

Thirteen floats draw the start card and the next twelve cards in order. Each higher/lower call consumes the next committed card — cashing out early just stops further reveals.

Because the whole ladder is fixed, you can verify every step of a long run, not just the card you lost on.

Odds and payouts

Each step pays by the true conditional probability of the next card (e.g. higher than a 4 vs higher than a Q) minus the edge.

How to verify a hi-lo round yourself

  1. Rotate or end the seed pair in your account so the casino reveals the server seed it committed to. Until that happens the hash is a promise, not a proof.
  2. Copy the revealed server seed, your client seed and the nonce of the round you want to check — the nonce is the round counter, not a timestamp.
  3. Paste all three into the verifier above. It recomputes the HMAC chain and derives the hi-lo outcome the same way the operator's server did.
  4. Compare the result with what your bet history shows. A mismatch on any single round is the only evidence of tampering that actually means something.
  5. Check the committed hash too: hash the revealed server seed and confirm it equals the hash the casino published before you played.

Verification proves the result was not changed after you bet. It does not make hi-lo profitable — the ~1% per step house edge is applied openly, in the payout table, and it is unaffected by any of this.

Frequently asked

Why 13 cards?

That covers the longest possible run of consecutive correct calls — every card you could have revealed is already committed by the seeds.

Other verifiers