sprawdzanie lokacji bloku

On place:

    if player's tool is diamond block named "cycu":

        set metadata value "cos" of event-block to true

On break:

    If metadata value "cos" od event-block is set:

        drop diamond at event-block

on place:
    if player's tool is event-block named "nazwa":
        set metadata value "cos" of event-block to true
on break:
    if metadata value "cos" of event-block is set:
        drop diamond at event-block

Mała poprawka, literówka.