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[“For instance,] the identity credential may be presented with only a portion of the information on the identity credential visible (such as the user’s name and birth date for proof of age),” says Apple, “and/or by providing a processed response to a request for information (e.g., ‘yes’ or ‘no’) based on information contained in the user’s identity credential.”
From Apple working on how to securely present electronic ID wirelessly | AppleInsider:
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