HAL, do you read me?

[professor rat]

A lot of our discussion is influenced by the ideas of David Chaum.  He
pioneered technology which could protect individual privacy while allowing
very flexible sorts of credentials and guarantees.  He has also played
a big role in the various proposals for digital cash.

But I think that Chaum has gone off in the wrong direction in the last
few years. . . "

https://marc.info/?l=cypherpunks&m=85281390301195&w=1