Middleware is a component of a computer system or network that exists in the system’s middle, often to enhance the overall functionality of the platform. Middleware is also known as the “service layer.” Middleware in a blockchain context refers to various systems that assist decentralized applications (dApps) in expanding their utility. Smart contracts, oracles, databases, digital identities, file storage, and various connectivity devices are examples of middleware in blockchain. Application programming interfaces (APIs), multi-signature technology, digital assets, blockchain governance systems, and other components are also included in the service layer.