I agree with this on cash deposits but I don't understand how you would run a real credit system with anonymous transactions and accounts.

How would you measure credit risk? How are charge-backs supposed to work?

There are reasons that credit card holders would prefer transparency and buyer protection over privacy.

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Agree! I used debit card and credit card interchangeably (wrongfully so) but if you're interested in the credit part, there's a nice writeup by moon settler:

https://gist.github.com/moonsettler/42b588fa97a1da3ac0adea0dd16dadf2

Credit would require either collateral or an account so the credit issuer can make sure that you pay off your debt.