new cryptographic protocol?

I am looking for a cryptographic protocol for anonymous, unlinkable authentication and selective disclosure of identity attributes.
Also, the protocol shall be based on elliptic curves.

What I mean is basically a merge of
1. the DAA (Direct anonymous attestation) protocol from Chen/Morrissey/Smart

2. the U-Prove protocol from S. Brands (is now IP of Microsoft)
(see or )

Does such a protocol already exist?