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Provably fair

Verify a draw yourself

We don't ask you to trust us. Every draw uses a commit-reveal method you can check independently, right here in your browser.

  1. Before a competition closes, we publish SHA-256(secret seed) — locking us in.
  2. At the draw, we combine the secret seed with a public randomness beacon (e.g. drand) nobody can predict.
  3. The winning ticket = HMAC-SHA256(seed, beacon) mod entries + 1.
  4. Afterwards, we reveal the seed. You recompute both values below and confirm they match.

Heads up — these are example values, not a real draw. They're here so you can see the maths work. Once a competition has been drawn, its own seed, beacon and entry count are published on its page and load in here for you to check.

Commitment check —

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Winning ticket —

Anyone with the same seed, beacon and entry count gets the same ticket number — try changing a single character of the seed and watch it change completely.