₿ The Book of ₿itcoin
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Money, law and markets


Bitcoin also lives in law and finance. These guides cover ETFs, stablecoin rules, US taxes and what happened at Mt. Gox, always from official documents and never with price talk.

Start with the first guide below, then read in any order. These guides are drafted by an AI assistant from primary sources and checked before publication. How we verify. Nothing here is investment advice.

How to use this guide

Read the first card to get the plain-words overview, then jump to whatever you need. Every article ends with its sources, and anything we could not confirm is marked as unconfirmed instead of guessed. If a word is new to you, the Glossary gives a short definition with a source.

What these guides do not do

They do not predict prices, recommend products, or tell you what to buy or sell. Opinions are kept in a box labelled “Our take (opinion, not fact)”, so you can always tell facts and opinions apart. New guides are added as new Field Notes are published.

The guides

Bitcoin ETFs: The 10-Year Wait, and the Judge Who Asked for HomeworkHow spot Bitcoin ETFs got approved in the US, from a 2013 filing to January 2024. Every date has a source and the fuzzy parts are Stablecoins and the GENIUS Act: What the Law SaysThe US passed a stablecoin law in July 2025. Here is what it says in plain words, what we could not verify, and why it matters forCan AI Agents Pay With Bitcoin? Short Answer: They'd Rather Use DollarsAI agents are getting wallets. Three standards (x402, L402, AP2) decide how they pay. Who does what, in plain words, and which num
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