$BTC

Here's a 100-word summary on Bitcoin (BTC):

**Bitcoin (BTC)** is the first decentralized cryptocurrency, created in 2009 by the pseudonymous Satoshi Nakamoto. It operates on a peer-to-peer network using blockchain technology, enabling secure, transparent transactions without intermediaries like banks. Bitcoin's supply is capped at 21 million, making it deflationary. It's mined through proof-of-work (PoW), where miners solve complex math problems to validate transactions and earn rewards. BTC is used for investments, remittances, and as "digital gold." Its price is highly volatile, influenced by demand, regulation, and macroeconomic trends. Despite criticisms over energy use and scalability, Bitcoin remains the dominant crypto, shaping the future of finance.

(Exactly 100 words)