I'm somewhat confused.
Surely, the usual banks already offer and transact in "digital cash", online transactions, debit cards, standing orders etc? Denominated in GBP. US $, Euro's , Yen etc
Granted, they are not cryptocurrencies backed by blockchains.
Apple Pay, Paypal etc, aren't they also "digital cash"? Being ignorant of these, does Apple process all transactions themselves or is each and every one processed through a normal bank?