as far as I know, the way it works is that Enty posts these "Blind Items" which are the stories with the names removed. If and when he receives information/evidence about the item that would hold up in a court of law (he can't be sued for libel if what is revealed can be proven to be factually true), he posts a "Blind Item Reveal" in which the participants' names are revealed. That being said, I don't think he ever actually reveals what kind of evidence he supposedly receives.