-Digital books and kindles replaced library books
-Regular mail was replaced by email
-Previously, we took actual photos; now we take digital photos
-Digital music replaced cassettes and CDs.
-We switched to direct deposit from cash or checks.
How often do you actually have cash? It's rare that I do! The next item on this list is money.
Then... Buy Bitcoins.
The time will come when any transaction will be done digitally and cold cash will no longer be used as a medium of exchange but I doubt that digital money would be a BTC or any cryptocurrency coin since the government won't let it happen.