CPChain is a new distributed infrastructure for next generation Internet of Things (IoT). CPChain intends to build a fundamental data platform for IoT system in combination with distributed storage, encryption computation, and blockchain technologies, providing the whole process solution from data acquisition, storage, sharing to applications. CPChain is a promising solution to a series of challenges of current ¡°chimney architecture¡± of IoT systems, reducing connectivity cost of devices, protecting data privacy and maximizing the value of IoT data.