bitcoin: bitcoin (P2P electronic cash system) bitcoin: bitcoin: Bitcoin is a free open source peer-to-peer electronic cash system bitcoin: that is completely decentralized, without the need for a central bitcoin: server or trusted parties. Users hold the crypto keys to their bitcoin: own money and transact directly with each other, with the help bitcoin: of a P2P network to check for double-spending. bitcoin: bitcoin: Project Website: https://www.bitcoin.org bitcoin: bitcoin: