Bitcoin (sign: BTC) is a decentralized digital currency based on an open-source, peer-to-peer Internet protocol. It was introduced in 2009 by a pseudonymous developer, Satoshi Nakamoto. Bitcoins can be exchanged through a computer or smartphone locally or internationally without an intermediate financial institution. In trade, one bitcoin is subdivided into 100 million smaller units called satoshis, defined by eight decimal places.
