GNU Taler v1.0 Released
taler.net
taler.net
Taler has "One-sided Privacy":
1. The payment system operators cannot track how a customer spends their electronic money (blind signatures)
2. merchants' income is transparent for tax collection authorities. This helps prevent tax evasion and money laundering.
Other privacy features: decentralized, no customer registration.
Multi-currency support, one-click payments, very suitable for micropayments.
And as you said, Taler also offers privacy for the buyer while maintaining accountability for the sellers (allowing taxability, accountability, etc.), which makes it a very good candidate for implementing a CBDC (central bank digital currency).
>Our work is co-funded by the European Commission and the Swiss State Secretariat for Education, Research and Innovation (SERI) as part of the NGI TALER project.