The basic design approach is likewise very straightforward. We use Hyperledger Composer to model the participants, assets, transactions, and events in a particular business network. We then use that model to generate both blockchain—smart contracts and ledgers that implement these elements that are deployed to the blockchain network created using Hyperledger Fabric. We also use the Hyperledger Composer model to generate a set of domain-specific APIs to access the transactions that manipulate them in the Hyperledger Fabric blockchain. As we've seen, these APIs will be used by applications on behalf of individuals, organizations, systems, and devices.