I don't think so, obscure but not anonymous.

Here: http://developer.mintchipchallenge.com/devguide/developing/c...

Each transfer message has both the Sender and Receiver encoded within it. These are opaque but generated by your mintchip provider.

Looking here: http://developer.mintchipchallenge.com/devguide/ecosystem.ht...

Suggests that your provider ("trusted broker") creates your mintchip ids. It might be possible to associate many keys to your physical person but I believe all of them could be traced back with the co-operation of the providers.

It's anonymous assuming the mint-chip value message and the mint-chip request message are not intercepted or stored. This is a PKI-based system, so they can verify if you signed a transaction. So if you use it online - you can't guarantee it is anonymous. If you use it in-person and nothing stores the request or response then, in theory, it should be anonymous.

The giant caveat is that the documentation online does not seem to indicate whether or not a transaction log is stored in the trusted hardware.

"No personal data is exchanged in the transaction" implies it, but I'd be astonished if there wasn't an auditable device ID trail.