I see GT is pushing his usual confused nonsense...
There is no digital cash without fungibility and there is no fungibliity without privacy.
What's 'private' about gold, salt, tea, coal, grain, oil or any other medium that even got used as 'base money'. They are all fungible and therefore anonymous. Whether they are 'private' or not depends on who happens to know you in possession of them, not on the nature of the money.
Speaking of which, when it comes to a worldwide network of electronic tokens such as crypto, what you want is something that everyone can see (like the aforementioned monetary precedents) but that no-one can know you own. How is that achieved ?
...by maximising TRANSPARENCY and FUNGIBILITY independently of each other so that the currency remains anonymous and homogeneous. Everyone can verify but every address looks like every other address. (Like tea, salt and grain).
Just so happens there is a cryptocurrency which implements those core principles of money.
The problems with fungibility through 'hiding' are:
[1] - it isn't fungibility by definition
[2] - if there's a lock then there's a key. The only question is who's got the key(s)
Like I say. A honeypot with more backdoors than a city brothel