Bitcoin Core is an open-source software under the MIT license that incorporates all the automatisms of bitcoin transactions. This software was initially developed by Satoshi Nakamoto, a pseudonym for one or more people, and is currently maintained by a team that lives on donations.

By downloading from the official website, you are downloading a full node, that is, a complete copy of the blockchain as well as a bitcoin wallet. Bitcoin Core development began with version 0.1.0. Satoshi Nakamoto participated in development until version 0.3.19 in 2010, leaving the project at that time for unknown reasons, it is speculated that he may have died. Gavin Andresen continued the work until 2014 when he handed over development to Wladimir J. van der Laan, who led a team.

Initially, Bitcoin Core used OpenSSL for cryptographic operations. However, this changed in 2015 due to errors discovered in OpenSSL. Among security flaws, there was one that allowed an attacker to read the RAM memory of a server and obtain the private keys. Another problem found was that OpenSSL used a "weak" source for random numbers, so the development team decided to create their own source. For these reasons, OpenSSL was removed from the Bitcoin Core source code.

Although it is true that Bitcoin Core is open-source software, in which we can see the code and even propose changes, only a small group of programmers has the control to make those changes incorporated into Bitcoin Core. A small and closed group, which is constantly tempted with offers from multinationals and governments. This problem of centralized development is real, but there are initiatives to solve it.

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