How do I detect if my custom block is removed? [SOLVED]

[KGS]

I have a particular block whose locations are tracked by a separate class.

 

Whenever my custom block is placed, the tracker is updated.

 

The problem is handling the block being removed. Is there some Block function that runs whenever that block is removed? Something that is guaranteed?

 

I only found one that triggesr when the player destroys a block, and one that triggers when the block explodes.

 

For safety's sake I want something that covers absolutely EVERY scenario possible.

[CJLetsGame]

public void breakBlock(World par1World, int par2, int par3, int par4, int par5, int par6)
    {

}