No vaccination, no entry. Citizens can display their paper card, the new "Key to NYC" digital app, or Excelsior app to prove their vaccine status. France and Italy have enacted similar measures.

New York state’s app, known as Excelsior Pass, states that it will provide “secure, digital proof of COVID-19 vaccination or negative test results.” ...

To prove you’re vaccinated, you have the option of showing your physical vaccine card or using either the Excelsior app or the soon-to-be-released “Key to NYC Pass” app.

ALBANY N.Y. — A new app will allow New Yorkers to prove they've received a COVID vaccine or tested negative for coronavirus ahead of attending events like a wedding, sports game or concert.