How do i make a procedure that checks for block that gets broken in a spcific area ?

hi i am making a mod and i want to be able to check in a radious of like 3 chuncks around a specific block if any blocks gets placed or broken by anyone else then the one who placed the block i was talking about . then if its not to much to ask to make it reverse these actions by exemple you find yourself in the radius of one of these try to place a block and this block breack itself . if that clear.