It all sounds a bit antiquated...like maintaining paper records. They will probably roll out some sort of rfid device, tentacled tattoos, stamp, or mark of some sort. Eventually, if you don't take the vaccine, you will be treated as a threat to society. Not taking the vaccine or device that proves you've been vaccinated may lead to your employer (source of income) MANDATING that you take it. How many people are willing to say no to their employer?
https://www.nytimes.com/2020/12/18/us/eeoc-employers-coronavirus-
You dont think your employer could make decisions for you? The EEOC already said they can.