The first wallet program – simply named "Bitcoin" – was released in 2009 by Satoshi Nakamoto as open-source code. In version 0.5 the client moved from the wxWidgets user interface toolkit to Qt, and the whole bundle was referred to as "Bitcoin-Qt". After the release of version 0.9, the software bundle was renamed "Bitcoin Core" to distinguish itself from the underlying network. It is sometimes referred to as the "Satoshi client". While a decentralized system cannot have an "official" implementation, Bitcoin Core is considered to be bitcoin's reference client. As such, it serves to define the bitcoin protocol and acts as a standard for other implementations. Today, other alternative clients (forks of Bitcoin Core) exist, such as Bitcoin XT, Bitcoin Unlimited, and Parity Bitcoin.

Reference implementation

Bitcoin

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