Secure storage method and application of power transaction distributed account book based on block chain

The invention provides a secure storage method and application of a power transaction distributed account book based on a block chain, and the method comprises the steps: periodically grading nodes according to a credit grading protocol, and selecting one node from a node set with the highest credit level as a main node; enabling the selected main node to participate in a consistency protocol, setting an overtime triggering condition for triggering a view switching protocol, and when the main node meets the overtime triggering condition, triggering the view switching protocol, replacing the main node, and otherwise, generating a new block; and executing a checkpoint protocol (Checkpoint) to release the log message subjected to consensus authentication of the consistency protocol, thereby reducing the memory overhead of the system. According to the method, the nodes are graded according to credit points by formulating credit point rules. Positive nodes participate in a consistency protocol, and negative nodes