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Getting started with Bitcoin Core
Bitcoin is an experimental digital currency that is maintained by an open source community. Bitcoin Core is the name of open source software that enables the use of this currency. It's the original implementation of the Bitcoin system and whose initial release was created by Satoshi Nakamoto.
Open source software is software whose source code is made available to the public with the right to read, modify, and redistribute it. Although open source code can be covered by different licenses, most of it is free to use for any purpose. Bitcoin is licensed under the MIT license.