Dual-mode block chain consensus protocol and method based on node identity authentication

The invention discloses a dual-mode block chain consensus protocol and method based on node identity authentication. The protocol comprises a preparatory protocol and a fast protocol which are mutually converted; the preparation protocol is used for selecting a main node and carrying out identity authentication on the main node; the fast protocol is used for processing the message and realizing fast consensus through the master node of which the identity authentication is successful, and then re-executing or re-executing the preparation protocol according to a consensus result; the method comprises a preliminary consensus part based on a preliminary protocol and a fast consensus part based on a fast protocol. According to the method, a default protocol is in a pessimistic environment, whether the current environment is safe or not and whether a main node is an honest node or not are detected by executing a preparatory consensus process, and after it is confirmed that the current environment is safe, a fast co