When a smart contract has vulnerability or an abnormal state, a super-node has the right to decide which transactions are added to the block and which one is to be frozen. At the same time, APO creates a point-to-point protocol as a legal constraint on the entire network. Users in the network need to sign on it. This protocol defines the obligations that users need to perform to resolve disputes between users. It also defines the source code for readable intent. Protocols, used to identify differences between bugs and features, direct the community to fix when errors occur. Every transaction in the APO network must use the hash of the protocol as part of the signature.