The services provided by the ASCH platform include a public chain and a set of application SDKs; the public chain is called the main chain. The ASCH application SDKs can be used to develop blockchain applications with a free-running, immutable ledger. These applications are also known as side chain applications. An application SDK has a built-in cross-chain protocol, through which the side chain can communicate with the main chain. In other words, the main chain has the function of asset routing, through which a variety of assets can flow among different applications. ASCH’s ecological system contains multiple chains, with each chain possessing the ability to carry multiple tokens or assets. Each token or asset can also be transferred to multiple chains.