HOH is a distributed data storage protocol based on blockchain technology. It aims to create a blockchain asset platform based on energy data to promote energy conservation, environmental protection, and efficient energy trading. HOH is a commercial public chain rooted in smart energy cities. In the design of the HOH ecosystem, the principles of energy conservation and environmental protection are also followed. By leveraging the characteristics of blockchain technology such as decentralization, lack of inherent trust requirements, distributed reliable databases, and programmability, it provides a series of feasible solutions to address the development bottlenecks encountered by the current internet in smart energy cities regarding trust mechanisms, value transfer, and interaction efficiency.