Abstract
Blockchain technology has become the hottest technology in the market because of its characteristics such as decentralization and data tamper resistance. With the development of blockchain, it is widely used in many fields. There are many types of blockchain, such as alliance chain, private chain and public chain. At present, the alliance chain has attracted extensive attention, but the commonly used PBFT algorithm still has many problems. In order to solve the high communication overhead and low efciency of PBFT consensus echanism, an improved PBFT consensus algorithm with a reputation mechanism are proposed in this paper. Diff erent permissions of nodes are made according to their diff erent reputation levels. Only the nodes with high reputation are qualifed to act as master nodes. Nodes with low reputation will be prohibited from participating in the consistency protocol and reduce the probability of becoming master nodes. In our scheme, the security, efciency and throughput of the consensus algorithm are improved, and the communication cost is reduced.
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