The symbol was encoded in Unicode version 10. Currency Symbols block in June 2017. Without proper rendering bitcoin information, you may see question marks, boxes, or other symbols.
It is the first decentralized digital currency, as the system works without a central bank or single administrator. The system was designed to work as a peer-to-peer network, a network in which transactions take place between users directly, without an intermediary. These transactions are verified by network nodes through the use of cryptography and recorded in a public distributed ledger called a blockchain. Bitcoins are created as a reward for a process known as mining.
They can be exchanged for other currencies, products, and services. As of February 2015, over 100,000 merchants and vendors accepted bitcoin as payment. The word bitcoin was first used and defined in a white paper published on 31 October 2008. There is no uniform convention for bitcoin capitalization.