> In Japan, there are already multiple apps which use something like this to verify user's age via the "my number card" + the smartphone's NFC reader.

Does this also leak your identity to the app?

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charcircuit 5 hours ago | parent [-]

There is not a way to share just your date of birth. After providing your PIN it can read more than just your date of birth.

	▲	klausa 2 hours ago \| parent [-]
		That's... partially true. If you use the _digital_ MyNa card (e.g. the one in the Wallet.app; not the plastic one); the iOS SDK lets you only request the "is user more than XX years old" flag; without getting the actual identity: https://developer.apple.com/documentation/passkit/requesting... Now, AFAICT nobody actually does this, but the technical ability is there.