# 2.3.2 L2 Layer 2 Network L2 (Layer 2 Network) is a solution to scale blockchain performance and throughput. In the L2 solution, opBOB (Optimistic BOBchain Virtual Machine) is one of its core components. opBOB aims to improve the performance of BOBchain Virtual Machines (BOBs) through optimistic execution. It is based on the PoVC arithmetic value consensus mechanism, which allows nodes (BOINC AI servers) to contribute arithmetic power through smart contracts for task assignment at the root node. Compared with the traditional consensus method of "solving complex mathematical problems", this method can greatly improve the processing speed and throughput of transactions, while avoiding the waste of arithmetic power and energy. The role of opBOB is to execute the model-trained transactions on the L2 Layer 2 network and submit the results to the L1 main chain. By moving the transactions from the main chain to the second tier network, opBOB reduces the burden on the main chain, improves overall performance, and reduces the cost and latency of the transactions. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://boinc-ai.gitbook.io/untitled/2.-bobchain/2.3-technical-features/2.3.2-l2-layer-2-network.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.