Interestingly, that&#x27;s already <i>kind of</i> available in some countries. I live in Austria, where we have a system called Bürgerkarte which utilizes PKI. One of the supported options are ATM cards (others being public health insurance cards, mobile phones or &quot;real&quot; smart cards). Unfortunately, it&#x27;s not very widely used and quite complicated to set up. This would definitely need to be an international effort to become viable.