The Privacy Pass protocol has been out there for a long time. It's simple to implement and deploy, and provides a straightforward way for services to provide safe private credits to their users.
Bluesky recently introduced a new form of verification. It’s a social version of the familiar notion of a blue check, in a way that is architecturally aligned with Bluesky and its underlying protocol ATProto. This allows notable accounts and accounts that are related to trusted organizations to be verified as authentic.