I presume that a register of those who have been vaccinated would be a much larger list. It would however aid efforts of everyone having a “vaccine passport” to

I presume that a register of those who have been vaccinated would be a much larger list. It would however aid efforts of everyone having a “vaccine passport” to help with getting international travel back to normal. A whitelist (as in people of who have been vaccinated) does seem to be more sensible to be in the case of international travel in case the vaccine passport is lost while traveling for example.