On the problem of proving it wasn't me, there's just one very simple question... Looking at the chat logs, this is what I would ask:

Why would I target a user who is needing a job due to being broke with malware, using an account easily linked to me? I'm sorry but it falls outside my range of stupidity to do that, the stupidest thing I've done was give my botnet access details to a friend who accidentally killed all my bots off, but that's a different story.