Eläimiä merkitään jo mikrosiruilla ja ihmisiäkin on jo alettu merkitsemään samalla menetelmällä.

Revelation 13

 16: He also forced everyone, small and great, rich and poor, free and slave, to receive a mark on his right hand or on his forehead,

 17: so that no one could buy or sell unless he had the mark, which is the name of the beast or the number of his name.
 18: This calls for wisdom. If anyone has insight, let him calculate the number of the beast, for it is man's number. His number is 666.