Bitcoin is a decentralized digital currency, without a central bank or single administrator, that can be sent from user to user on the peer-to-peer bitcoin network without the need for intermediaries. Ledger start: 3 January 2009 (12 years ago) Code repository: github.com/bitcoin/bitcoin Code: BTC, XBT Original author(s): Satoshi Nakamoto Initial release: 0.1.0 / 9 January 2009 (12 years ago) Supply limit: ₿21,000,000 Symbols: BTC, ฿, ₿