The era of COVID-19 free passes begins. As vaccinations against COVID-19 are getting underway around the world, vaccine passports and digital health credentialing projects are actively rolling out now. Israel has released its Green Passports, the World Economic Forum has developed "Common Pass," and IBM is also testing its "Digital Health Pass". Since these "vaccine passports" hold vaccination status, as well as personal information such as name, sex, and date of birth, many of these passports, are built on blockchain technology—considered to be secure from data leaks and impossible to forget. Pass&Go , a Korean company-developed mobile application for COVID-19 Free-Pass.