con_thing_master

Main thing contract which owns con_thing_info

create_thing(thing_string: str, description: str)

Arguments

• thing_string: as string representation of the thing that is to be unique
• name: A name for this thing, which will be unique to the contract (max 25chars). Names are formatted to lowercase and all spaces removed. This is done to enforce uniqueness.
• description: a description of the unique thing (max 128chars)
• meta: A dictionary object for passing in meta info about the thing which is outside of the required thing data.

Purpose

Creates a unique thing in the smart contract

Asserts

• uid already exists in state
• description exists and has a length <= 128
• name exits, is unique, and has a length <= 25
• thing_string exists

buy_thing(uid: str):

Arguments

• uid: unique id of the thing you want to buy

Purpose

Transfers ownership of the thing after transferring the "price" in TAU from tx sender to owner. This requires a previous tx to currency.approve to give "con_thing_master" permission to transfer on the sender's behalf

Asserts

• price > 0, "thing is not for sale"
• if price_hold: price_hold == tx sender, "thing is being held for someone else"
• (in currency contract) TAU balance of tx sender == allowance provided for con_thing_master

sell_thing(uid: str, amount: int)

Arguments

• uid: unique id of the thing you want to sell (must be owner of thing)
• amount: the amount, in TAU, to list thing for

Purpose

Allows the owner of a thing to set a price, in TAU, that the thing can be bought for.

Asserts

• owner == tx sender, "thing not owned by sender"

sell_thing_to(uid: str, amount: int, hold: str)

Arguments

• uid: unique id of the thing you want to sell (must be owner of thing)
• amount: the amount, in TAU, to list thing for
• hold: supply a vk to make the sale exclusive to this person

Purpose

Allows the owner of a thing to set a price, in TAU, that the thing can be bought for. This thing can only be bought by the person who matches the "hold" value.

Asserts

• owner == tx sender, "thing not owned by sender"

give_thing_to(uid: str, new_owner: str):

Arguments

• uid: unique id of the thing you want to sell (must be owner of thing)
• new_owner: the vk to transfer ownership to

Purpose

Allows the transfer of a thing without a TAU transaction

Asserts

• owner == tx sender, "thing not owned by sender"
• owner != new_owner, "thing already owned by new_owner"

like_thing_to(uid: str):

Arguments

• uid: unique id of the thing you want to sell (must be owner of thing)

Purpose

Allows any lamden user to like a thing. One vk can only like a think once

Asserts

• ['likes'][uid]['tx sender'] == None, "can only like a thing once"

prove_ownership(uid: str, code: str):

Arguments

• uid: unique id of the thing you want to prove you own
• code: a code you will store as the proof

Purpose

Allows a user to prove they own an item by storing a code associated with that thing.

Asserts

• owner == tx sender, "thing not owned by sender"