Vaccination proof for travel outside the USA is not a new requirement. However, since there are people who object to vaccination requirements, I am curious enough to ask “what is the down-side?” On the other hand, what are your thoughts on having travelers arrive in the USA who have no “proof” of negative response to the COVID-19 infection with them? I wonder whether that works for us in the USA healthwise.
For your information, some businesses are already accepting the New York – Excelsior Pass, which is “digital” proof of vaccination and “virus-tested” passport. In fact, Madison Square Garden used it recently to allow admission. Is it disconcerting to you when businesses use this option as a way of assuring their clients/customers that some attempt at protecting them from COVID-19 infection has been made?

At this writing, New York is, to my knowledge, the first US State to have a “digital” version of vaccination proof, which can be accessed on a mobile device. The Excelsior Pass is valid for 180 days after the final dose of the vaccine. When it expires, a new Pass can be activated. The COVID-19 PCR Test pass is valid until midnight on the third day after a test. After it expires – it can still be seen on your device in a dimmed format.
I am pleased to report, that I was able to download the free Excelsior App to my iPhone. After scanning the QR (Quick Response) code that is assigned once a vaccine or test is given, I was able to retrieve my information onto my mobile phone. As a result, I have “digital” proof of my vaccine history and a recent COVID-19 PCR Test. I do not have to print out a copy of my credentials. All I have to do is provide a photo ID.
If you want to, you can also use Excelsior Pass at the website, and print a paper pass without using the mobile app. Read more about it at this link: NY State Excelsior Pass