Bitcoin has a jargon problem. This is the reference you reach for when the words arrive faster than the explanations.You looked up hardware wallet and suddenly needed to know what a private key is. You tried to understand the halving and someone mentioned stock-to-flow. Each answer opens three new questions.
The Bitcoin Encyclopedia collects 167 of those concepts in one place - the economics that explain why Bitcoin exists, the cryptography that makes it work, and the custody decisions that keep it safe. Every entry is written in plain English, with no assumed knowledge and no code. It is a book to look things up in, not to read cover to cover. Each entry follows the same shape: a plain definition, the story behind why the concept exists, a real-world analogy to make it stick, and a clear "so what" for why it matters to you. Where Bitcoin has genuine debates or real weaknesses, they are named honestly. Inside, you'll find: