Oh! In that case: absolutely nothing. Credit cards are terrifyingly insecure. Whether or not the info is on two sides or one. Any webshop you use your credit card at can just arbitrarily charge it from then on if they feel like it.

As far as I understand it the pin&chip system involves a challenge/response between the bank and the card. You can’t just “clone” the chip, because the secret data it contains is essentially write-only.

Nano has a cheat sheet at the bottom of the screen at all times

And definitely not zognoids!