Bitcoin was the first cryptocurrency created in 2009 and uses blockchain technology to enable peer-to-peer transactions through private keys. Since then, several other cryptocurrencies have emerged that operate using either the SHA-256 or scrypt algorithms. Some major cryptocurrencies discussed are Litecoin, which promises faster transactions than Bitcoin and has a larger coin limit, Ether which enables programmable applications on the Ethereum blockchain, Ripple which focuses on large global money transfers using XRP, and Zcash which focuses on privacy through anonymous transactions. These cryptocurrencies paved the way for new cryptocurrencies like Ducatus Coin to offer alternative forms of digital currency.