NCTN (New Circulation Chain) is a representative of the public blockchain in the era of blockchain 4.0. It is a public blockchain built on the fog computing framework, aiming to create a user-friendly, easy-to-use, and open light blockchain ecosystem.NCTN is based on the fog computing architecture, which not only gathers various heterogeneous devices around it to form a decentralized computing engine, but also creatively designs galaxy super contracts, enabling on chain smart contracts to maximize the utilization of the powerful computing resources of fog computing. In addition, it can also gather computing resources from idle devices around it to empower blockchain, accelerate the integration with current mainstream technologies such as artificial intelligence, big data, the Internet of Things, etc., jointly usher in a new era of intelligent blockchain, and deeply promote the application of blockchain technology in real life....