Cross-layer protocol refers to a framework that enables communication and interaction between different blockchain layers or networks. Blockchains often consist of multiple layers, such as the base layer (also known as Layer 1) and various scaling solutions or secondary layers (Layer 2). Each layer may have its own rules and functionalities.These protocols facilitate interoperability, allowing assets, data, and information to move seamlessly across different layers. For instance, transactions that occur on a Layer 2 solution can be easily communicated back to the Layer 1 blockchain, enhancing efficiency and scalability.The benefits of cross-layer protocols include improved user experience, reduced transaction costs, and enhanced speed. They also help integrate various blockchain technologies, promoting collaboration and innovation among different projects. By fostering interaction between diverse protocols and layers, cross-layer protocols aim to create a more cohesive and functional ecosystem, ultimately leading to a more adaptable and user-friendly environment.