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    The protocol is fun (I must admit I only know the basics). I once wrote a python script that seeds to a single predefined IP/port combination. Scenario is that a friend downloads something, which you already have and you want to support him, but not the whole BitTorrent network.

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      I hadn’t heard of this client before! Very cool (and permissively licensed).

      There’s quite few bittorrent implementations around, maybe a handful actively used / maintained? Lots of clients derive from the original or use libtorrent. It’s understandable, imho, because the protocol, extensions and details like those mentioned in this blog are rather complex.