Access Read Only Profile from QR Scan

I do have a Wordpress Site with additional fields on user profile available, where I need these improvements to make: 1. In order to subscribe, User has to type an unique QR Code that I provide to them. 2. Then, let Each Logged User (customer) to select if each attribute/line of their profile could be shared or not into a PUBLIC profile. When the logged subscriber saves his profile 3. ANYONE (not only owner of the account) can scan an specifc QR Code (field of the Subscriber profile) and access READ ONLY the registered user profile (showing only the attributes/lines that the owner of the account selected on step 2). Basically the idea is to provide QR Wristbands to customers and, in case of accident, anybody can scan his wristband and identify who person is. That's it.