Notes on building end-to-end encrypted and CRDT-based local-first applications (kerkour.com)

Sylvain Kerkour has released detailed notes on developing end-to-end encrypted and conflict-free replicated data type (CRDT)-based local-first applications. He distinguishes between "local-first," where each device acts as the truth source, and "offline-first," which relies on a centralized server. This distinction is pivotal for the AI/ML community as it emphasizes the need for unrestricted offline capabilities and local data management, influencing the design of decentralized applications. Kerkour compares popular CRDT libraries—Yjs and Automerge—highlighting Yjs's superior performance in handling document updates. His initial benchmarks reveal Yjs significantly outpaces Automerge in scenarios with high update volumes, which is essential for scaling real-time applications. He also discusses the challenges of managing key distribution for end-to-end encryption, examining several methodologies, including symmetric and asymmetric cryptography. The notes provide critical insights for developers seeking to create robust, secure applications, stressing the importance of proper data handling and integrity in distributed systems.