Blockchain is the technology that enables the existence of cryptocurrencies. Bitcoin is the name of the best-known cryptocurrency, the one for which blockchain technology was invented. A cryptocurrency is a medium of exchange, such as the US dollar, British Pound, or Euro, but is digital and uses encryption techniques to control the creation of monetary units and to verify the transfer of funds. This is the descriptive introduction to Cryptocurrencies and Blockchain technology. The 160 pages in this book explain the technology and various cryptocurrencies, including Bitcoin, Ethereum, Ripple, Tether, Polkadot, Cardano, Stellar, Litecoin, Bitcoin Cash, and Dogecoin.