About

What this service does.

Raffleroll lets you run deterministic, verifiable winner draws. Every draw stores enough information to reproduce the exact result later.

Draws use a hybrid seed derived from a server secret commitment and public randomness (drand), plus the frozen participant hash. The result page publishes the proof needed to recompute the seed and reproduce the draw.

Public draws are visible to anyone and expire after 24 hours. API draws require an API key and are retained for 1 year.