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Provably-fair · pay-per-use NockApp · demo
Forfeit High Card
Provably-fair war — two distinct cards, higher rank wins, suits break ties.
Outcome construction (public)
playerCard = H(…‖0) mod 52, houseCard = first H(…‖d), d≥1, ≠ playerCard → higher rank wins; ties: ♣ < ♦ < ♥ < ♠
Forfeit High Card — round #0
demo · no real NOCK1House commits
The house locks a secret serverSeed behind its hash — it cannot redraw either card afterwards.
2Player commits
Your clientSeed is half of both draws — neither side can steer who gets the higher card.
Draw & recompute
Complete both commitments, then reveal — your card is H(serverSeed ‖ clientSeed ‖ nonce ‖ 0) mod 52, the house walks draws 1, 2, 3… until it lands on a different card. All recomputed live in your browser.
Launch evidence
Settlement residual (honest)
Fairness and forensics are fully trustless. Settlement is bonded-cooperative + timeout-forfeit (HTLC-grade), not contract-grade forced payout — Nockchain consensus cannot gate a payout on the game outcome. Disclosed in docs/FAIRNESS-DOSSIER.md.
This is the fairness and forensics showcase: the commit-reveal flow and the verifier run entirely in your browser and no real NOCK changes hands. Real-NOCK play is gated behind a house wallet, fakenet end-to-end testing, and the disclosed settlement model.