SAT is a decentralized application platform. It provides a suite of SDKs and APIs to assist developers in building decentralized applications based on Javascript and sidechain technology, ensuring ease and security in their use. Leveraging the SAT ecosystem, developers can rapidly iterate their Javascript applications and publish them to the systems built-in app store, making them accessible and beneficial to end-users. The entire process is securely guaranteed by the credit-secure SAT consensus network. Distributed nodes download and execute these processes. The SAT system itself is a fully open, decentralized application with an embedded token. It interacts with Start chain or Dapps via a two-way peg mechanism, serving as a bridge and medium for asset conversion between all Dapps.