SAVE is a decentralized cloud storage platform and programmable blockchain using blockchain technology. Compared with traditional cloud storage methods, the decentralized SAVE system can make cloud storage safer, faster and lower cost. Through erasurecoding, encryption, and blockchian, SAVE not only has traditional cloud storage functions, but also solves the security and privacy problems of traditional cloud storage. The server that the user provides the storage space can receive the built-in token of the SAVE system, so as to encourage more idle space to become the storage space provider.