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In-depth Bitcoin articles about how the network works, its history and the ideas shaping its future.
What makes a bitcoin transaction trustworthy?
Anyone can check it: a signature proves the owner approved it, every node checks it against the rules, and proof of work makes it costly to undo.8 min read24 October 2026What is a UTXO?A UTXO is an amount of bitcoin that has not been spent yet. See how these pieces make your balance, become payments and change, and affect fees.22 October 2026Is bitcoin still legal tender in El Salvador?The label remains, but a 2025 reform ended compulsory acceptance and bitcoin tax payments. What the law says, and what changed in practice.20 October 2026What was Silk Road?A hidden website where people bought and sold illegal drugs, paying only in bitcoin, from 2011 until the FBI shut it down in 2013.18 October 2026Who were the cypherpunks?Programmers and privacy activists who, from 1992, built privacy tools on an email list. Hashcash and b-money, both in Bitcoin’s white paper, began there.17 October 2026Should Bitcoin freeze coins to stop quantum theft?No freeze has been agreed. The proposals differ on hiding public keys, migration deadlines and whether owners could still recover old coins.17 October 2026Does Claude's ECDSA discovery put Bitcoin at risk?Claude reconstructed a recipe for five public cryptographic curves. Those seeds are different from wallet seeds, and Bitcoin uses another curve.RSS feed