Dear Subscriber, hi this is one of those occasional requests for information, in this case sources knowledgeable about the use of bitcoin and virtual currencies among the criminal underworld. I'm looking for folk deep into this subject who could offer comment, analysis and data. If you think you can help, or know of someone who can, could you let me know today if possible? (No need to reply if it's not your bailliwick, or send back any written comments; I'm interested in finding a few folk who can help me deep dive into it.) 

Many thanks in advance. 

Best, Jeremy