[Spooky23]

It's a waste of time.

If you're doing something illegal that will attract serious attention from competent police, you are dumb for using electronic communication to do it. Smart mobsters did their business face to face in the 1950's. Smart street-level drug dealers use proxies (kids, grandparents, etc) to conduct transactions.

If it's just an exercise in screwing around looking for theoretical security, nobody cares. Best case, you're wasting time better spent elsewhere. Worst case, you're going to get in trouble for laundering money via bitcoin.

If you're a leaker, etc. You'd have better security printing and mailing cash to people. Mail content is protected legally and requires a warrant to open. If you insist in using technology, print a GPG-encrypted letter in an easily OCRable font.