Chapter 3 Design the smart contract is executed; all the events along with the transaction are recorded in the network and stored in a blockchain. These transactions are appended in the blockchain, hence immutable in nature. Blockchain Platforms A DXP provides the capabilities to deploy and integrate the different components of the DXP application with the blockchain platforms, that is, Hyperledger, Etherum, Multichain, Hydrachain, Corda, Openchain, Quorum, and IOTA, as shown in Figure 3- 24. DXP and Blockchain Network Three kinds of networks are involved while integrating blockchain with a DXP, as shown in the following design. • Enterprise network: Existing applications reside in your enterprise network, which contains the organization’s data that may be deployed on stand-alone infrastructure or cloud infrastructure, as shown in Figure 3-25. • Public network: An organization’s data is exposed using REST APIs to the public network, where users (analyst, administrator, auditor, operator, business user) of the application can utilize the authorized data after authentication in the form of an analytic chart, monitoring services, API management, and Blockchain explorer (see Figure 3-25. • Blockchain network: The blockchain network consists of blockchain components, that is, smart contract, ledger and transaction, e-certificate, membership services, public–private key infrastructure, and interoperation, that contain events and communication protocols (see Figure 3-25). Blockchain is of two types, that is, public blockchain and private blockchain. In case of a public blockchain, anyone can be allowed to participate in the network, can execute the network, and maintain the ledger; in a private blockchain, identity services maintain the roles and responsibilities, so that only members of the blockchain can execute the network and maintain the ledger. In addition, a DXP supports integration of an open- source private business blockchain network. 98