While Pinterest won't send a notification saying "User X has unblocked you," there is a technical side effect that could tip them off.
When you unblock someone, the immediate effect is that you can once again view each other’s profiles, pins, and boards. However, the connection does not automatically restore. If you were following each other before the block, those follows are permanently deleted the moment the block is initiated. To reconnect, one of you must manually follow the other again. Since you don’t get a notification for the unblock itself, the other person will only realize they’ve been unblocked if they happen to visit your profile and see that your content is visible again or if they receive a new follow notification from you. does pinterest notify when you unblock someone
If you are ready to unblock a user, here is how to do it quickly and quietly: While Pinterest won't send a notification saying "User