CBDCs have NOTHING to do with blockchain or cryptography or cryptocurrencies. They are digital in the sense that your credit card is digital which is to say that the liabilities exist in their base form on a digital (computer) medium, not physical(paper) medium.<p>You could choose to incorporate a blockchain in a CBDC implemnentation but why would you. Central banks have central in their name whereas a core value proposition of blockchain is decentralization. The Fed isn't going to wake up tomorrow and decide it wants to decentralize the dollar.
Money was a technology long before crypto. Those in power have been using their control over money to leverage control over the physical world for millennia. In modern times this control has belonged to national governments, but historically religious institutions like the Knights Templar also had that power. They were never going to give up this control. Crypto has only lived this long because it was a fantastic way to launder money. Now that block chain analysis has advanced to a point where crypto is not the cloak it used to be, the rich and powerful no longer have a purpose for it. The digital currency portion of crypto is definitely the future, but it will not be run by those with the most servers.