Editing Portal:Crypto and Blockchain (section)

=== Bitcoin and the beginning of cryptocurrency ===

'''Bitcoin''' was introduced in 2008 by the pseudonymous Satoshi Nakamoto in the white paper “Bitcoin: A Peer-to-Peer Electronic Cash System.” The paper described a system for sending online payments directly between parties without a financial institution, using digital signatures, proof-of-work, and a peer-to-peer network to prevent double-spending.<ref>Satoshi Nakamoto, “Bitcoin: A Peer-to-Peer Electronic Cash System,” https://bitcoin.org/bitcoin.pdf, accessed July 3, 2026.</ref>

Bitcoin is important historically because it turned cryptographic ideas into a working public network. It combined public-key signatures, hashing, proof-of-work, network consensus, transaction validation, and a public append-only ledger. Later cryptocurrencies, smart-contract platforms, tokens, and decentralized-finance systems grew from this model, even when they changed the design.

For Perl programmers, Bitcoin was interesting for several reasons. It exposed programmable interfaces, used well-documented encodings, depended on cryptographic primitives, produced large amounts of structured and semi-structured data, and encouraged the creation of small tools around wallets, nodes, exchanges, mining pools, block explorers, accounting systems, and payment flows.