[Mediterraneo10]

While the technology you are developing may allow that proof of COVID status, as the OP mentions, it is questionable if it will actually be used broadly in many countries. When countries have already reopened their hospitality sectors to all regardless of status, then they may be loathe to begin requiring COVID proof. Nor do hospitality staff necessarily want to given the duty of checking statuses.

So if COVID status proof is required country-internally over the coming months, in many countries it will probably be used for mass events (e.g. the UNTOLD festival in Romania) but otherwise not.

[radicalbyte]

It's more about "nudging" people towards getting vaccinated from my stand point. That's how we get through this pandemic.

I do strongly hope that the entire system will no longer be required come the end of 2021, or this time next year at the latest.

For the Exposure Notification apps the same thing applies.