An Improved-PoA Consensus Algorithm for Blockchain-empowered Data Sharing System

In a traditional data sharing system, each participant has carried out the construction of the corresponding database. However, due to the different research objects and data completeness of each participant, it is difficult to form effective interconnection and data sharing among databases, the phenomenon of data silos is still serious. Blockchain has the advantages of high trustworthiness, data immutability, and has a high fit with data sharing systems. While data sharing has brought a lot of benefits, a series of problems caused by bogus data have also emerged. Trust issues becomes a prerequisite for the implementation of the data sharing platform. To address these problems, this paper proposes an improved data sharing method based on the consensus algorithm of Proof of Authority (PoA), implements a distributed data transaction authentication system using a consortium blockchain. To improve the throughput and reduce the latency of the consensus mechanism, temporary grouping of PoA validation nodes is performed and different blocks of data transactions are validated in parallel between each group of validation nodes. After the experimental results in this paper, it is shown that the proposed Improved PoA consensus mechanism improves the throughput by 27.65% and reduces the latency by 21.66% than the traditional PoA consensus algorithm.