Fundamentals of Cryptocurrency and Block Chain Technology. This is course is for intermediate students who are interested to learn about Blockchaintechnology and Cryptocurrency. This Chapter deals with the Fundamentals of Cryptocurrencies. A cryptocurrency (or crypto currency) is a digital asset designed to work as a medium of exchange that uses strong cryptography to secure financial transactions, control the creation of additional units, and verify the transfer of assets. Cryptocurrencies use decentralized control as opposed to centralized digital currency and central banking systems.