I thought it looked an awful lot like David Chaum's DigiCash. If they haven't brought Chaum into the discussion, I would be very nervous about using Taler.

[edit] Yes, he has been involved. https://www.heise.de/en/news/39C3-How-the-open-source-cash-G...

original https://chaum.com/ecash/

new and improved https://chaum.com/wp-content/uploads/2022/11/eCash_2.0_9-7-2...

Interesting stumble upon. https://chaum.com/wp-content/uploads/2023/11/Better-than-mon...

Also: https://www.snb.ch/en/publications/research/working-papers/2...