save variable to particular item,block HOW

[mynameisjosep]

guys i want to save variables particular,specifed block,item
what is the code
example
on place coal ore:
set {dontbreak} to coal ore

on break coal ore:
if {dontbreak} is specifed:
cancel event

 

[Nikd0]

on place:
    set event-block to {dontbreak}
on break:
    if event-block is equal to {dontbreak}:
        cancel event

I did not test it, however there it should work