Nice chain (extreme chain) is a distributed and decentralized secure IoT light operating system based on blockchain. After fully considering the technical characteristics of the Internet of Things and the needs of business ecological construction, NEC has made great efforts to the existing digital asset issuance, encryption algorithms, smart contracts, market-oriented consensus incentives, decentralized DApps (Distributed Applications), and fast access to new services. The blockchain technology is deeply optimized to realize the seamless integration of the bottom layer of the blockchain and the application ecology of the Internet of Things, so as to ensure the benign, rapid and sustainable development of NEC's business ecology, and realize the symbiosis and co-prosperity of coins, chains and industrial Internet of Things , create a blockchain ecosystem of trusted IoT digital assets, efficiently realize the circulation and value transformation of credit digital assets, and create a global benchmark for the ecological integration of IoT and blockchain.