MPEG-21 Media Contract Ontology to
Smart Contract



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This is a demo for the MPEG21 MCO to Smart Contract UPM Response to N19504, based on Ethereum Smart contracts. The transformation from an MCO contract into a smart contract is performed by considering payments as transactions and actions to be performed on IP entities in the form of assets, i.e. Non Fungible Tokens
In this demo:
1) Each IP entity has its own identifier and a dedicated smart contract.
2) It is considered only one smart contract at the address 0xBbdA7C2fB654F901B38743A6A6D5afC27497791d of the Ropsten test network. If you are reading here you should have installed Metamask , so switch to the Ropsten test network in the extension for the correct functioning.
3) This smart contract holds all the infos regarding MCO contracts related to this IP entity. Infos consist in a list of MCOContract structures, in which each struct contains parties (Ethereum addresses) and pointers to Non Fungible Tokens.
4) ERC721 Tokens are generally used for assets, debts or virtual collectables (games) and are, together with ERC20, the actual main use case for smart contracts.
5) When you click on "Upload MCO Contract to Ethereum Blockchain" a new MCOcontract structure is created within the main smart contract, taking in input the data that it is found on the left editor.
6) The left editor reads JSON-LD files encoded from MCO contracts. Parties are associated to random addresses, while for each DeonticExpression a new ERC721 token is minted. Each token will be assigned to the Permission/Obligation/Prohibition assignee and an URI will point to the action infos.
7) The right editor shows data that is ACTUALLY STORED ON BLOCKCHAIN. Basically all the token issued since the start of the implementation.
8) The bottom left editor shows part of the final smart contract created from the information found in the JSON-LD when payments are involved.