A whitepaper lays out the vision, architecture, and technical rationale behind a blockchain project. Bitcoin's nine-page whitepaper, released in October 2008, elegantly described how a peer-to-peer electronic cash system could work without a trusted third party — introducing the world to the blockchain and proof-of-work. For any crypto project, the whitepaper is a primary source for understanding its goals and mechanics, and reading it critically is a valuable step before investing or building.