If they had enough evidence to incriminate you, then you would have been arrested. The police do not call their suspects when they have hard evidence and give them time to flush contraband/wipe hard drives etc. Because on levels of dumb, that would be a 10.Ring them back and ask if you are under arrest. If not, then decline their offer of a meeting. Simple. You are not obliged to appear on demand because the police wish it to be so. They can only force you to do things if you have a warrant out for your arrest.If you do wind up in the interview room, then you simply refuse to acknowledge anything about the silk road, imprint et al. Advise watching "Don't Talk to the Police" on youtube to understand precisely how that works.