Marx was a supporter of hard money, not fiat and CBDCs.

I'm sorry your grandfather was duped by capitalist grifters.

Your gradfather should have read a book from time to time, or studied the academics lol

http://heteconomist.com/value-of-fiat-money-on-the-basis-of-marx-in-light-of-mmt/

If my dad were still around he would have fucking loved Bitcoin.