No - we won't need a means of exchange. Money will be abolished completely. Of course you're right that paper and metal money is as imaginary as the cryptocurrencies, so you'll concede that this would be very easy indeed to do. No forms of exchange, no money, no credit, no debt, no bartering - nothing. No pay. No rent. No till in the supermarket. You put into the communal pot what you can and take out according to your need. I've explained this many times and it's really very simple. As for the desperate self-justification used by various posters in this thread, which seem to be suggesting that cryptocurrency will somehow transfer power from the current paper/metal money oligarchs to their dear selves, thereby making things much more 'democratic' - it's a laughable fig leaf for shameless speculation. You'll appreciate that due to reasons of heconomics, neither we Kremlins, nor the vast enormous overriding overwhelming majority of the world's population have no opportunity or possibility to take part in this cryptocurrency speculation even if we wanted to? To believe that swapping economic power from one set of speculating oligarchs to another tiny set of speculators represents some exercise of democratic power transfer is just risible.