The Bitcoin Whitepaper, Section by Section

The Bitcoin whitepaper is Satoshi Nakamoto's nine-page, twelve-section 2008 paper proposing a chain of digital signatures, a timestamp server, Proof-of-Work, and the longest-chain rule to prevent double-spending without a trusted third party. Notably, the whitepaper never uses words like "blockchain," "21 million," "halving," or "wallet," and today's implementation differs from it in several respects.