Starcoin is a layered smart contract and decentralized financial network. Starcoin inherits the excellent security mechanism of bitcoin, and provides the ability of high transaction throughput by improving POW algorithm and introducing multi-layer network. In addition, we have created a layered smart contract model, which can provide a secure and stable cryptocurrency infrastructure and meet the performance requirements of defi. STC is the native token of starcoin network. Its current main purpose is to pay gas fees for transactions. Pay the state space fee (after the future state billing mechanism is activated). Used for governance voting on the chain. In the future, with the maturity of the chain ecology, STC will have more and more usage scenarios.