Published onNovember 9, 2025Chainlink VRF: Secure, Verifiable On-Chain RandomnesschainlinkvrfsolidityrandomnessoraclessecurityethereumA practical, intermediate guide to Chainlink VRF covering the security model, VRF v2 subscriptions, unbiased randomness patterns, local mocking/testing, and gas/cost optimizations for production-ready smart contracts.