Minecraft wiki entry for Block_entity_format, associated text: : The block entity's root tag.
 TransferCooldown: Time until the next transfer in game ticks, naturally between 1 and 8 or 0 if there is no transfer.
 Items: List of items in this container.
: An item, including the slot tag.
 Slot: The inventory slot the item is in.
Tags common to item stack[show]