Re: "BlitCoin": "unmasks one or both ends of a BitCoin transaction"?
Just to confirm my own code changes...Are you logging the ip from the 'inv' or the 'tx' message? I originally logged the 'tx', but realized that the 'inv' message comes first. 
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Logging from "tx", i think your right it might be better to log from inv (although when the client asks for an inv item the response will come from the same node).