The point was about you saying “voluntarily” identifying yourself, which wouldn’t work out in a society since nobody wants to identify. For cryptographic signatures, it would be the worst possible idea for freedom. If you would research blockchain architecture, you would see that there are 2 types of Blockchains (Public and private). A Public blockchain would allow me to potentially see a lot of your activities. You don’t want that privacy wise. The governments are pushing for private blockchains. With your “signature” and biometric they will be able to verify you and track you. Since they would have laid out the infrastructure, they will push for a CBDC and they will then be able to track your spending and control your funds. Please, go read about the topic of blockchain and stop listening to these Bitcoin Superstars on podcast. If you are really into government conspiracy read on CBDC and government blockchain.