$BTC Bitcoin ($BTC) 💰** is the first & largest **decentralized** 🌐 cryptocurrency, created by Satoshi Nakamoto (pseudonym) in 2009 🗓️. It runs on a public **blockchain** ⛓️ ledger, secured by **proof-of-work** ⛏️ ("mining"). Key features:

1. **Decentralization:** No bank/government control 🏴☠️.

2. **Fixed Supply:** Capped at 21M coins 🧮 (19.5M+ mined ⚒️), creating scarcity.

3. **Digital Gold:** Often a store of value 🛡️ or inflation hedge 📈.

4. **Peer-to-Peer:** Direct transactions ↔️, no intermediaries 🚫.

5. **Volatility:** Price has significant swings 📉📈.

BTC pioneered blockchain tech 💡 & remains the dominant crypto by market cap 🥇, driving the digital asset ecosystem. Seen primarily as an investment 💹 or value transfer network 🌍. #btc $BTC