The Bitcoin dictionary, honest edition.

Bitcoin in plain language. Every term that matters - from the addresses you send coins to, to the BIPs that govern how the protocol evolves - explained without the marketing and without the hype.

This is the dictionary I wish someone had handed me my first week. Each entry leads with a one-sentence definition. Then it goes deeper: what it is mechanically, what it is for, what the tradeoffs are, and where it sits next to other concepts. Every on-chain number you read here was checked against a real Bitcoin node. Every source links out so you can verify it yourself.

Use the search below to jump to a term you have heard but never quite understood. Browse the featured cards if you do not yet know what you do not know. Jump to a letter if you came here for one specific definition.