You don’t need to read the changes at the other end. Each side of the entangled pair records state change and compares it after the fact. That is sufficient.
“Each side of the entangled pair records state change and compares it after the fact. That is sufficient.”
No, it’s not, because if you are only reading the state change on your end, you have absolutely no way of knowing if the changes you are detecting are those caused by actions on the other side. The uncertainty principle, along with the observer effect, preclude that.