Bitcoin is a decentralized digital currency, without a central bank or administrator. It was invented in 2008 by an unknown person or group of people using the name Satoshi Nakamoto. Bitcoin as a crypto-currency holds highest market capitalization. The currency began use in 2009 when its implementation was released as open-source software. Bitcoins are created as a reward for a process known as mining. They can be exchanged for other currencies, products, and services.