CSD (Central shopping area memory chain, central shopping park memory chain) is a decentralized, social, fully open source, reserve and other resources, and a comprehensive collection of entertainment consumption based on Ethereum platform. The open source software designed and released is a branch of the ETH network and a digital currency in the form of P2P. Unlike most currencies, CSD does not rely on a specific monetary institution to issue, it is generated through a large number of calculations based on a specific algorithm. CSD uses a distributed database composed of many nodes in the entire P2P network to confirm and record all transaction behaviors, and uses cryptography design to ensure the security of all aspects of currency circulation.