The 10 concise facts about cryptocurrencies: 1. Decentralized: Most cryptocurrencies operate without central banks or authorities. 2. Blockchain: They use blockchain technology for secure, transparent transactions. 3. Bitcoin: Bitcoin, created in 2009, was the first cryptocurrency. 4. Volatility: Crypto prices are highly volatile, often fluctuating rapidly. 5. Mining: Cryptocurrencies like Bitcoin are mined by solving complex algorithms. 6. Limited Supply: Many cryptocurrencies, including Bitcoin, have a fixed supply. 7. Altcoins: There are thousands of alternative cryptocurrencies (altcoins). 8. Smart Contracts: Ethereum introduced smart contracts for decentralized apps. 9. Crypto Wallets: Digital wallets store and secure cryptocurrencies. 10. Global Use: Cryptocurrencies are increasingly accepted for payments worldwide.