How to Verify a Bink Result
Every Bink Original is provably fair. That means you can verify, with cryptographic certainty, that the result of any round you played was determined by a seed Bink committed to beforethe bet — not chosen after. Here's how.
What you need
- Your committed server-seed hash (visible in Settings → Provably Fair before any round).
- Your client seed (visible in the same place; you can change it any time).
- The nonce of the round you want to verify (round number — also visible in your bet history).
- After seed rotation: the revealed server seed.
Step 1 — Confirm the seed wasn't swapped
Take the revealed server seed and hash it with SHA-256. The output should match the committed hash you recorded before any bets were placed. If it matches, the server never changed the seed mid-session.
Step 2 — Re-derive any round outcome
Compute HMAC-SHA256(serverSeed, clientSeed + ":" + nonce). The first 8 bytes of the output map to a 0.00–100.00 float; the rest of the bytes feed game-specific outcome mappers (Dice maps the float to a roll, Plinko maps it to a peg sequence, Roulette maps to a slot, and so on).
If you don't want to run the math by hand, paste the triplet (serverSeed, clientSeed, nonce) into the live verifier at /provably-fair or the per-game verifier at /games/<game>/verify. It returns the exact outcome the server produced.
Step 3 — Read the open source
The outcome-mapper for every Bink Original lives in packages/crypto-utils/src/games/. It's open-source — you can audit the exact code that ran on the server for every round you played. Bink's own self audit walks that same code with published test vectors, so you can reproduce our checks alongside your own rounds.
What this proves
If a single round's computed outcome diverges from what Bink showed you, the server tampered with the seed. There has never been such a divergence — but the point is you don't need to take Bink's word for it. Verify any round, any time.
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