The dollar is the current dominant currency is why it’s expressed in it.
I do use dollars. I own Bitcoin because it has appreciated faster than any other asset the past 14 years and I think it’s going to continue that trend. I also have lost faith in governments doing the right thing and believe in separation of states and money.
Anything can be used has money. Humans have used shells, gold, silver, beads, and etcs as currency throughout history. We currently use an excel sheet. The hardest money will end up surviving and in my opinion that will be Bitcoin. Every fiat currencies has went to zero as governments debase the currency and over time people lose faith in the currency.
Im not sure? I do know miners help secure the network and anyone who runs the network can verify transactions.