A next-generation Certificate Transparency log built on Cloudflare Workers

The document outlines the evolution of Certificate Transparency (CT), highlighting the new static CT API that replaces dynamic read endpoints with cacheable tiles to improve reliability, integrity, and cost-efficiency. It details Cloudflare’s Rust-based “Azul” implementation on Workers (using Durable Objects, R2, and KV) that scales sequencing via batching and achieves high throughput for submission APIs, along with the release of test logs. The report also discusses future pressures on CT from shorter certificate lifetimes and larger post‑quantum certificates, arguing that the static CT API and diversified operations will help the ecosystem scale.