Silk Road Judge: Tor Browser's “mumbo-jumbo to most people on the jury” (forbes.com)

You never have "just a random citizen" in any jury trial. The process of jury selection is intended, among other things, to screen out people that are not likely to be biased in one way or another. The fact is the silk road was a market for illegal drugs (at a minimum). The technology should be in the background. Jurors don't need to fully understand every aspect of encryption and its use in illicit transactions to be able to make a judgement, in the same way that they don't need to understand everything about accounting to make judgements about financial fraud.