The definition of cryptocurrency is a digital currency built with cryptographic protocols that make transactions secure and difficult to forge. The most important feature of a cryptocurrency is that it is not controlled by any central authority: the decentralized nature of blockchain makes cryptocurrency theoretically immune to old forms of government control and interference. Cryptocurrencies make it easier to carry out any transaction, as transfers are simplified through the use of public and private keys for security and privacy purposes. These transfers can be made with minimal processing fees, allowing users to avoid the high fees charged by traditional financial institutions. However, the latest news about cryptocurrencies indicates that as they lack a 'central bank', a cryptocurrency balance can be wiped out by a computer crash, hack and other unexpected events.