Bitcoin Core is the reference client of bitcoin. Initially, the software was published by Satoshi Nakamoto under the name Bitcoin, then Bitcoin-Qt, and later renamed to Bitcoin Core. For this reason, it is also known as the Satoshi client. It is a full client used by bitcoin nodes that create the bitcoin network. Through changes to Bitcoin Core, its developers make changes to the underlying bitcoin protocol. As of 2016, Bitcoin Core repositories are maintained by Wladimir J. van der Laan.
The MIT Digital Currency Initiative funds some of development of Bitcoin Core. The project also maintains the cryptography library libsecp256k1.
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