I hate to be a nitpicker, but your signed message just confirms that someone on the internet with that address is recently selling 5 shares. Personally identifiable information (e.g., your username) helps narrow that down.
For instance, I could now take all that information you posted and move it to another website somewhere and "sell" my asicminer shares on the same basis.
Furthermore he does not accept escrow...
OH! Now I get it. Because that just shows whoever wrote the original message owns the address, but DOESN'T say it was zrgf. Duh. That was stupid of me. Thanks.
Even though the auction's over. Just for posterity, here's proof that I do in fact own that address:
I am zrgf and I should have said so in the first message. Oops. 2013-11-03 20:49
HPpeEtgD9WjyXLXNvTqpyJuV85PZMGlDzHX8M/4B0pJOkyqlN7JHl5XA+n3z26l9M50UVZoQBEaqSjWcx8gJdb4=