such certificates, often called “vaccine passports,” are a complicated topic in their own right. Europe’s plans have raised questions about how governments will manage to link up different national health systems while keeping people’s data secure and private. The systems will likely hold sensitive information including a person’s name, passport or identity card number, date of birth, the vaccine they have taken and the number of doses administered. Europe is trying to roll out the Vaccine PassPort but not sure how to accomplish that goal. Imagine if Selfkey could solve that problem for them by putting the passport recipients info in the Selfkey wallet protected by blockchain technology. That would get selfkey known everywhere.