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Satoshi's original Bitcoin code had a built in poker game hidden inside it
The first version of Bitcoin released in January 2009 contained a class called CPokerLobbyDialogBase
It had framework code for an on chain poker game, an IRC chat client and a peer to peer marketplace all built into the mining software
The poker code was added on April 16, 2008, months before the whitepaper was even published
It stayed in the codebase for years and wasn't fully removed until Bitcoin version 0.8.2
Nobody knows why Satoshi built a poker game into a digital currency
The code is still visible today on GitHub in the original Bitcoin v0.1 source code, lines 1573 to 1731