Admittedly, Im not familiar with CAcert, so I dont know how strong proof that is. The link doesnt mean anything to me, perhaps you can elaborate on that? Other than that, there is nothing that proves his ID.
Go back in the thread, and you'll also find someone who checked his ID in person at a Spanish bitcoin meeting, as well as links to a colloquium where he spoke, with pictures and all.
P4man, those words are about me. I saw vescudero ID card issued by Spanish state and his driver license. He saw mine too. As you already know I'm identified in bitmit and you bought some pendrives from me.
We can discuss about this is a good business model or not, all of these stuff are just guessing. But, for me, otoh, and many others bitcoiners in Spain, vescudero is the person he says to be.