The IBlockAction function can be added to a Block and, depending on where you added it, will be triggered when the block is placed or broken.

It might be required for you to import the package if you encounter any issues, so better be safe than sorry and add the import.
import mods.contenttweaker.IBlockAction;

The IBlockAction is a function with the following parameters:

• IWorld world → The world the block is in
• IBlockPos position → The Block's position
• ICTBlockState state → Contains information on the block, such as the Block itself and its metadata

The function doesn't have a return value!

ZenScript
 Copy
zsBlock.onBlockBreak = function(world, blockPos, blockState){
    print("I WAS PLACED!!!");
}