Revelation 13:17 says, "And that no man might buy or sell, save he that had the mark, or the name of the beast, or the number of his name." The world is being moved into unison of dealing with issues and eventually the mark will be introduced. These trackers, like the digital vaccine id cards, are not the mark but is tracking something. Currently, it will be if a person received the vaccine or not, eventually, it will track to see if the Mark has been received or not.