Bitcoin

The world's first decentralized cryptocurrency, launched in 2009 by the pseudonymous Satoshi Nakamoto. Bitcoin introduced the concept of blockchain -- a distributed ledger that records transactions without requiring a central authority. It started as an ideological experiment in financial sovereignty and evolved into a speculative asset class, a hedge against inflation, and a geopolitical flashpoint. Governments have banned it, embraced it, and built national reserves around it. Whether it is digital gold, a bubble, or the future of money is a question that has defined an entire era of economic debate.

Added by @ishaanc