Chapter 3 Design engines, data pipelines, and IoT will lead us toward smart cities. A citywide information network could be linked to sensors and a digital experience platform that enables the city to provide automated street lighting, waste management, digital bus routes, and smart parking. • Digital wallets: The IoT can extend the capabilities to automate payments through devices such as digital wallets, which can be attached to each device. For example, digital wallets attached to cars can pay for fuel charges, road taxes, etc. • IoT smart payment contract: Smart contracts are computer programs that verify and enforce the negotiation of a contract. Data captured from IoT devices can execute the smart contract and the system would deduct the payment by coordinating with the bank. • Banking through wearable: The ecosystem of IoT is growing day by day. Many banks have started providing services through wearables like the Apple watch, etc. Applications could be built for already existing wearable devices for contactless digital payments. Integration of IoT devices with a digital experience platform enhances usability. Blockchain Design Blockchain could be used to record transactions or events, which would be replicated exactly across all the nodes in a network. Every node would have a copy of records that cannot be edited or deleted. We will look into Blockchain concepts, smart contracts, the Blockchain platform and its design components, along with a use case study in this section. Let’s look into Blockchain concepts using a book and library analogy. What is Blockchain? Here is an attempt to understand blockchain with the analogy of book and library. It is a known fact that an accounting book is called a ledger, every page in the ledger is connected to other pages in sequential order, and these pages contain transactions. Pages can be considered as blocks and the book can be considered as a blockchain. 96