https://www.siliconvalley.com/2021/08/10/vaccine-passports-are-taking-off-how-to-prove-your-covid-19-vaccination-status-on-your-phone/

Vaccination against Covid-19 is increasingly becoming a ticket of entry into restaurants, gyms and indoor performances — or all of the above, if you’re a New York City resident.

Rather than misplace your vaccination card, you can log your vaccination status on your phone to use as proof as you reenter public spaces. You’ve got a few options for confirming you’ve been vaccinated, from scannable QR codes to scanned documents that live among your digital files, versions of “vaccine passports” that can get you in venues that only allow vaccinated patrons.