None do, not yet (hopefully in the future!). Hence you are operating on trust, like people were with Pirateat40, or Zhou Tong. The history of Bitcoin is rife with scams, so I'm a little taken aback that nobody understands the potential for one here.
so, this is irrelevant to the discussion of AM, and merely a criticism of bitcoin investing in general, then?
what, exactly, is your purpose on this thread?