Spawning additional torrents from a torrent - Beginner questions

[tabua]

I don't know if this is the right place to ask this, nor am I sure about the best/easiest way to implement this.

So basically, I would like to experiment with the torrent protocol and test a few concepts I thought about. But have close to zero experience with torrent related development, so bear with me here.

So the main idea would be a torrent being able to spawn other torrents on the client granted they are signed by the creator of the original torrent.

Details about client permission to download and such, are not my main concern at the moment. Those would be addressed at proper time. Right now I have a lot of more basic questions, to which I would kindly ask for some helpful replies.

I think the best way to implement this is by creating a plugin for a client (utorrent for example) that will look inside the torrent contents and proceed accordingly. By 'proceeding accordingly' I mean look inside the torrent, figure out in some way hashes to other torrents so they can be added through a magnet uri, and verify their authenticity in some way.

Hou would I implement this. Does utorrent supports a plugin API that expose all the necessary functionality? If so, where should I start looking? I would prefer to start by supporting utorrent because of its ubiquity, but not FOSS, there might be some limitations to such hacks, being them technical or legal. In that case I would go for deluge or maybe transmission. Please do not get into irrational client wars here.