Public key and key handle would still be unique and unlinkable for each account on the same site with the same u2f token. The yubico documentation is pretty goo

Public key and key handle would still be unique and unlinkable for each account on the same site with the same u2f token. The yubico documentation is pretty good at explaining this https://developers.yubico.com/U2F/Protocol_details/Overview.html https://developers.yubico.com/U2F/Protocol_details/Overview....