I think that everyone has such friends) Before we all very fiercely debated on this topic, it's hard to explain to people what the blockchain is, and as it became clear in the end and do not need it, it's the same thing to ask the nurse how she takes delivery)))it Took a little time, and the guys just forgot that I do it, so I advise you not to debate on the subject of bitcoin to whom it is not interesting, and leave everything as it is.