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Its a bit hard to differentiate because most people use fiat. When you buy gas, do you buy with bircoin?
Yes, I live on Bitcoin standard for years. What you still don't get? A private trade is only between you and me. We can agree to use whatever we want as money in exchange, even pink shells. Is nobody's business what agreement we have.
As long as you accept my pink shells is only our business and if I am happy to pay you in pink shells, is all good.