Startup for crypo cash in form of cards

A card similar to bank card, that does stores a private key, but it is impossible to copy the key itself from the card.
There should be a way to regenerate the key using real random.
It should be possible to ask the card to sign any transaction using this key.
It should be possible to get public key from the card.

So the card itself may be given from person to person.

It should give an API similar to [Keplr](http://keplr.app/), but nether allow to copy the private key, it should impossible on hardware level.

https://keycard.tech/ - it should be tested how well this project answers the requirements from above.