Now is the era of big data, because of the epidemic, you can still check your personal whereabouts. You can get personal trajectories by querying big data travel cards. At present, big data travel cards have been applied nationwide. As long as citizens go to any place, they will leave footprints on their travel cards, which can be inquired.
Gantong code is a personal two-dimensional code generated through automatic audit by combining people's self-declaration information with government figures. In areas where electronic health codes and electronic passes are not implemented, people who work, study, live, travel or stay temporarily need to apply for using the trunk code.