Harnessing chaos in Cloudflare offices

This post details the expansion of Cloudflare's LavaRand system to include new physical entropy sources from its London (double pendulums) and Austin (mobiles) offices, in addition to the original San Francisco lava lamps. It explains how images of these chaotic physical systems are captured, hashed to derive random bytes, and then used to seed a CSPRNG. The post also highlights how this enhanced randomness can be made available to external applications via an API for both private (e.g., key generation) and public (e.g., verifiable random draws, timelock encryption) use cases.