How to verify drand randomness beacons in your app using 30 lines of code

Developers building agents that rely on random numbers often use HTTP relay APIs, but these relays cannot be independently trusted to deliver unaltered data. The drand project, operated by the League of Entropy, publishes a public randomness beacon every three seconds using BLS signatures, allowing anyone to verify results offline with a pinned public key. By fetching the same round directly from drand's own endpoint and comparing it against the relay's response, developers can confirm the beacon has not been tampered with or replayed. A small code example using the drand-client npm package demonstrates how to perform this cross-verification in under 30 lines. The approach reduces reliance on relay trust and enables reproducible, auditable random sampling for use cases like reviewer selection, tie-breaking, or raffles.