Transaction method based on block chain, electronic device and readable storage medium

The invention relates to the block chain technology, and provides a transaction method based on a block chain, an electronic device and a readable storage medium, the method comprises the following steps: after receiving a local area network networking request sent by a first node in a wide area network, creating a local area network composed of the first node, a second node and a third node according to a preset networking rule; wherein the wide area network is constructed by all nodes in a block chain network; obtaining a network segment code of the created local area network, and determining an intelligent contract corresponding to the network segment code of the created local area network according to a preset mapping relationship between the network segment code and the intelligent contract; and after a transaction request with the second node and the third node initiated by the first node is received, running the determined intelligent contract in the created local area network to perform read-write ope