The **js‑ipld‑block** library provides a minimal JavaScript implementation of IPLD’s Block data structure—a binary blob paired with a CID (content identifier). It lets Node.js or browser‑based applications create, inspect, and transport such blocks, primarily for developers working with IPLD, IPFS, or other content‑addressed systems. (The project is now archived; newer functionality lives in the js‑multiformats packages.)