I'll readily entertain the possibility of tangible artifacts over some bytestream any old day of the week. If he's busted with a bunch of fake IDs on his person, I'd consider that to be evidence proper.
But anything transpiring in the netherworld of the internet needs to be taken with a grain of salt, especially when no real-world violence erupted.
It may be possible that this is the guy. The evidence that rings truest in my mind is that there was a real world cause-and-effect chain of events that occured immediately after his arrest. The shit hit the fan, and the site went down. Clearly, the real world arrest had a direct influence on the availability of the website.
But given the DEA's predilection for parallel construction, and the NSA's predilection for electronic dragnets, can we take the narrative of how they came to bust the Ulbricht at face value? Even if he was breaking the law, was he apprehended lawfully? Did they come into possession of this digital evidence in a lawful manner?
If Ulbricht gets off on a technicality for the crime he's charged with, I wouldn't lose sleep over it. He's being charged with the hypothetical thoughtcrime of killing an internet persona (or two). To me, that feels like a technicality to begin with.
If the people he killed never existed to begin with, then how can we be sure that the evidence that supports these ideas was collected and not crafted?
He may be the real deal, the guy himself, responsible for The Silk Road. But if you're going to put him away with that in mind, justice is not served unless he's charged with the crime he's being punished for, and justified by the true story of how they nailed him. I want to know what was truly so evil about The Silk Road, such that it might necessitate some sneaky peaky, in order to lock up the man responsible for it.
Maybe they achieve their goal of unmasking him, through this direct relationship of arrest and then site outage, but does that mean we have to swallow this murder-for-hire wrap too, no matter how flimsy it feels?