PBFT Consensus Algorithm Based on Bayesian Theory

Consensus algorithm is a method to ensure that all nodes in the blockchain network reach a consensus,such as PoW and PoS.The consensus mechanism affects the performance of the blockchain system.In order to solve the problems of low throughput and long delay of existing blockchain consensus algorithms,this paper improves the PBFT algorithm in blockchain,introduces a dynamic trust model based on Bayes theory,changes the trust of nodes in the consensus round through the node trust mechanism,and conducts group operations according to the trust degree.In addition to ensuring the stability of PBFT,the system scalability is improved,and the joining and exiting mechanism of network nodes is perfected,so that the network scalability is improved.Through experimental tests,compared with traditional PBFT algorithms,the improved algorithm has a 25% improvement in throughput,and the delay is only half of that of PBFT when the number of nodes reaches 50.These two indicators also have a 20%~30% improvement compared with HotStuff algorithm and Paxos algorithm.