No

Huh? They have thousands of nukes

Your currency is stored locally on your device and transferred directly to the merchant when transacting. The marchant software can also be selfhosted. It just has to communicate with with the centralized exchange for deposit into traditional bank accounts.

https://www.taler.net/en/features.html

Somewhat

It seems sellers can host their own payment receipt service and the verfication comes from cryptographically signing the money when it’s issued from issuers