There are brand new face scanning and eye scanning technologies that will work way better than a microchip implant.Nobody would want to have some microchip under his/her skin.This is ridiculous.
Even fingerprint technologies are a way beter alternative.
even myself i don't want theres a device attached on me even if it's too small it will be weird but if someday they have develop some system like thisface and eye scanning and fingerprint technology seems to be easy to bypass . let's say face scanning is easy to bypass but fingerprint is more accurate on suggestion . hope when they propose some transaction using bitcoin they will use the fingerprint.