By definition, "A\u00a0cryptocurrency\u00a0(or\u00a0crypto currency) is\u00a0digital 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. Cryptocurrency is a kind of digital currency, virtual currency or alternative currency."\u00a0 Cryptocurrency and digital assets were created/birthed with the intention of being decentralized, however there are many cryptocurrencies that are not. The control of each cryptocurrency works through distributed ledger\u00a0technology, via the\u00a0blockchain, which serves as a public financial transaction database. The first ever released was\u00a0Bitcoin, first released as open-source software in 2009. Since then, over 4,000\u00a0altcoin\u00a0(alternative coin) variants of bitcoin have been created.