Shops

[SOF3]

• A shop consists of an Item Type, Item Source, an Item Sink, a Money Source, a Money Sink and a parameterized transaction label set.
• A shop is first created by a Shop Creator, then interacts with the Customer.
• A shop can only have one item type.
• Item sources/sinks:
  • Infinity
  • Inventory of the customer
  • Chests in a world
  • A "cloud chest" which is backed by an account where 1 value = 1 item
• Money source and sink are account label selectors, partially parameterized at the time of shop creation and fully parameterized at the time of shop interaction.
• Methods to interact with a shop are independent of the shop definitions. A shop may have zero or more methods of interaction, such as:
  • Commands
  • Block interaction