The same as for the credit card payments you just mentioned (which ARE insecure and naively rely on store clerks not copying your 3 digit number etc). ANY biom

The same as for the credit card payments you just mentioned (which ARE insecure and naively rely on store clerks not copying your 3 digit number etc). ANY biometrics you use to pay can be easily replayed. Whatever function you derive from these biometrics can be executed when you’re not there. Not to mention that the biometrics themselves can be emulated by a device (eg voice recording) as you see in sci-movies like Minority Report (fake eyes) or that star trek clip. Sure, for smaller amounts and using copious amounts of “seller beware” chargeback protections, the system can work. And those chargebacks can be good for many things, so that is how our financial system works now. But if you want to secure thing that are valuable, like elections and many others, then what I described is the optimal solution.