Sia is the leading decentralized cloud storage platform. Sia leverages blockchain technology to create a data storage marketplace that is more robust and more affordable than traditional cloud storage providers. Through erasure coding, encryption, and blockchian, Sia not only has traditional cloud storage functions, but also solves the security and privacy problems the traditional cloud storage has. The server where the user provides storage space can receive Siacoin (cloud storage coin)-the built-in token of the Sia system, which incentivizes more idle space to become a storage space provider. Users can use Siacoin to rent or sell storage space. SC2 (SiaCore) was changed to SC (Siacoin) on December 20, 2018.