A cryptocurrency is a digital or virtual currency that uses cryptography for security. Unlike traditional currencies issued by governments, cryptocurrencies are usually decentralized, which means they are not controlled by a single authority. Bitcoin, the first and most famous cryptocurrency, was created in 2009. Since then, many other cryptocurrencies known as altcoins have emerged. Cryptocurrencies work https://amazoniansgreencoin.com/ on blockchain technology, which is a distributed and publicly accessible registry of all transactions. Blockchain ensures transparency and security of transactions.