Security
Bitcoin and Blockchain Basics
The Block·November 11, 2026·1 min read
Bitcoin is the first cryptocurrency, a decentralized digital currency with a fixed supply of 21 million coins. It uses a peer-to-peer network, Proof of Work security, and transparent but pseudonymous transactions. Bitcoin demonstrated how a network could record value transfers without relying on a single company, government, or bank to update the ledger.
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