CPC (Closed Chain, Close.Public chain) is an industrial application foundation jointly established by German financial regulators and well-known German venture capital. Distributed storage, cloud computing, AI, 5G wallets, exchanges, multi-dimensional applications in the whole industry, tokens, financial management, foreign trade, real estate, social networking, shopping malls, games and a comprehensive digital asset full-industry ecological circulation scene, and at the same time with The Chinese community ecological builders, the consensus team and related Chinese enterprises have achieved multi-industry ecological applications. Based on the advanced public chain and parachain technical architecture of the joint chain, it provides the underlying technology of circulation and transaction settlement and comprehensive financial solutions for participating ecological enterprises. It also provides individuals with a new ecological experience that combines applications, entertainment, social interaction, and income.