I’m not sure if this is the right place for this topic/question, so if someone wants to move it please do.
It’s come to my attention that some debit cards store transaction logs on the card itself. Apparently Starling Bank cards do, but Monzo cards don’t. It doesn’t overly concern me except that anyone with an NFC reader can see these transactions. However, I am wondering what the use of storing the transactions on the cards is in the first place?