DonutKing — standalone round verifier

Plain HTML + JavaScript, no framework, no network: everything below is computed in your browser with the Web Crypto API. Paste the export from /fairness (or type the inputs) and compare the outcome line. The algorithm and every table is written out in docs/FAIRNESS.md; you can read this page's source to check it. This file lives at /verify.html; save it and open it from your disk to run it fully offline.

Every round carries the rules version it was played under (the site verifier's export includes it). Rounds from before the 2026-09-15 house-edge retune are v1 (coinflip 1.96×, 0.99 factor, the old plinko / crate tables); everything since is v2. Both constant sets are embedded below — pick the round's version, or the replay will not match.

Paste the export JSON from the site verifier (the whole block, or just its input)

Kind Game Rules version

Server seed (revealed) Server seed hash (commitment, optional)

Client seed Nonce Message override (rooms: roomId:seedA:seedB)

Options (params JSON) Player actions (JSON list; derived from state when empty)

Recorded result (JSON, optional) Recorded multiplier ×100 / drop slot

Stored round state (JSON, multi-step rounds)