What I'm interested in is how you plan to protect the users' private keys (even from employees of your company)?
Nobody has access to the private keys, they are created by the chips inside Tangem Notes. You can't import or export these keys. You can't get them out in a lab, because the chip is an EAL6+ secure element. You can't hack the firmware it's based on EAL6+ cryptographic libraries, has minimal attack surface and 100% audited both internally and by one of the best independent security groups.
Of course there's a limit to security and reverseengineering labs in China get upgraded we have a dynamic roadmap to improve security in anticipation of more sophisticated attacks and attack vectors.
That's what a impenetrable security is. So it is safe to carry it with you any time you want? By the way how much would cost a single bitcoin banknote would be? Does is have some sort of technology that it could connect to the internet and sync it's value to the current market? Bitcoin could gain massive supporters with these, people would able to understand more what is bitcoin if they see something like paper money but in a different and far more better.