In Taiwan, we developed what is called meronymity, or partial naming, so that you can make an attestation credential that says, “I prove that I’m over 18 years old,” or “I prove that I’m a Berliner,” or that I graduated from this school, and so on. But they do not reveal anything else. It’s called zero-knowledge so that you can present this credential, and anyone can verify this credential, but in doing so, they don’t learn anything more about you.