This is a common misconception. Bitcoin isn't anonymous, but there isn't really a way to use your addresses as an "identity" easily, either. Sure you could us

This is a common misconception. Bitcoin isn't anonymous, but there isn't really a way to use your addresses as an "identity" easily, either. Sure you could use a Bitcoin address as the keypair it is to authenticate yourself, but that seems like an odd way to sign up for a service.