Origins

Bitcoin's ideas did not appear fully formed in 2008. This section covers the thirty years of cryptography, failed companies, mailing-list arguments, and unfinished proposals that came before it, and then covers Bitcoin's own first two years as a running system.

What you need to know first

Nothing beyond general familiarity with how computers exchange data over a network. This section deliberately comes before Cryptography and Distributed Systems. The goal here is historical and motivational context, not mechanism. Later sections explain the "how" behind ideas this section only names, such as hash functions, digital signatures, and consensus.

Chapters

1. Why Digital Cash Was Hard: the double-spending problem and why every pre-Bitcoin system needed a trusted third party
2. The Cypherpunk Movement: the mailing list and the people on it, 1992–2008
3. David Chaum and DigiCash: blind signatures and the first real attempt at cryptographic digital cash
4. Hashcash: Adam Back's anti-spam proof-of-work, and its reuse in Bitcoin mining
5. b-money: Wei Dai's 1998 proposal, cited directly in the Bitcoin whitepaper
6. Bit Gold: Nick Szabo's proof-of-work-based digital scarcity design
7. Who Was Satoshi Nakamoto?: documented fact versus speculation about Bitcoin's creator
8. The Bitcoin Whitepaper: a section-by-section walkthrough of the original paper
9. The Genesis Block: Bitcoin's first block, mined January 3, 2009
10. Early Bitcoin History: v0.1, the first transaction, early development, and Satoshi's departure

Next

Bitcoin is a response to an economic question as much as a technical one, why money exists, what makes something work as money, and what happens when trust in money breaks down. Continue to Money and Economics.

If you want the technical mechanisms first and the economic and historical framing later, you can instead skip ahead to Cryptography.