Bitcoin Core is the reference implementation of the Bitcoin protocol, written in C++, that validates transactions and blocks while maintaining a full copy of the blockchain. Developers use this repository to understand Bitcoin's core consensus rules, contribute to the protocol's development, or build applications that need to interact with the Bitcoin network. It implements the peer-to-peer networking, cryptographic verification, and distributed ledger functionality that underlies the Bitcoin cryptocurrency.

679 open issues · last updated Jul 23, 2026