Indeed, the idea sounds pretty interesting. Currently, I'm working with a mobile app development company so I think you can contact us if you need some assistance in the development of the app that will perform such verification
So had he contacted you? Really want to see this app, sound like something cool!
@david-verbeck Nice idea David! Unfortunately it's unlikely this would work effectively using NFC, as you'd need to be really close to the reader to register (< 4cm). You'd then also need to have a powered reader around your neck also.