Germany has an electronic ID card that can be used to certify identity, or only age, or only uniqueness, for a few pennies per auth. There's an app that lets yo

Germany has an electronic ID card that can be used to certify identity, or only age, or only uniqueness, for a few pennies per auth. There's an app that lets you use your Android phone as a scanner, paired over wifi. Yet I've never seen any company use it. Everyone uses slower, more expensive private services that don't ask any questions about what you're going to do with the data they collect.