I saw an article on a proposed US CBDC [here](https://www.cnn.com/2022/03/11/tech/us-digital-dollar-cbdc/index.html) and don’t understand how it would be different from a current direct credit or debit card (e.g. one that directly pulls from your bank account and not one that sends you a bill every month.)
My guesses as to possible differences and subtopics I’m confused about:
* Would this CBDC be publicly/privately mined, meaning the fed is no longer in direct control of the mint speed unless they exert control over the bounties?
* Would it be 1:1 exchanged with/for USD or be a replacement, eliminating cash entirely?
* How would you gain the benefits of a public ledger system (as the article indicates is desired) without making public all the private banking transactions of the individuals (zero knowledge proofs maybe?)