What can see a server of a Bittorent when I contact with it through Tor?

[starslights]

Well Tor are not made for the protocol bittorent and it will hurt the network, 
you can only use Tor to communiacte via the tracker, who will see the exit 
relay ip but your peer will done in direct from your pc to the pc connected to 
you, so see your true ip. 

You must look about i2p or BitBlinder projects for such things

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