I can see great potential for the an app like that to be of key use in our day to day lives. We've already got vaccine passports, but I wonder if a negative test on the day you're going somewhere would act as its own 'passport' to entry to certain places as well.
Might be an alternative to those who haven't been vaccinated too, and provide greater peace of mind when visiting those in higher risk areas like hospitals or nursing homes -where proving a negative covid test is already a necessity.
