Blockchain Cryptocurrency

Blockchain — a distributed, append-only ledger where transactions are cryptographically linked in blocks and validated by consensus among network participants rather than a central authority — was invented by the pseudonymous Satoshi Nakamoto in 2008 as the underlying technology for Bitcoin. The key innovation: eliminating the need for trusted intermediaries (banks, governments, notaries) by replacing institutional trust with mathematical proof and distributed consensus. Bitcoin (launched January 3, 2009) was the first application — a peer-to-peer electronic cash system allowing value transfer without banks. From a 2010 price of $0.003, Bitcoin reached $69,000 in November 2021 before falling to $16,000 in 2022 and recovering to $100,000+ in 2024. Ethereum (launched 2015) added smart contracts (self-executing code on the blockchain) enabling DeFi (decentralized finance), NFTs (non-fungible tokens, proving digital ownership), and DAOs (decentralized autonomous organizations). The blockchain industry has experienced spectacular collapses (FTX's $32B collapse in 72 hours, 2022; Terra/Luna $40B collapse; 3 Arrows Capital bankruptcy) alongside genuine innovation. Bitcoin's energy consumption (150+ TWh/year) exceeds Argentina's.