Multi-Path Transmission Method for Blockchain Block Synchronization Data Based on Software Defined Network

The development and application of blockchain technology are constrained by its system performance. An increasing amount of research focuses on enhancing the scalability of blockchain systems to address the contradiction between the growing user demands and the relatively low system processing efficiency. The goal is to optimize the performance issues related to throughput and transaction latency. Blockchain systems rely on a peer-to-peer overlay network (P2P) for information transfer, and the network traffic data can be categorized into control traffic, transaction propagation traffic, and block synchronization traffic. Block synchronization traffic arises when new nodes join the network and request historical blocks, resulting in high bandwidth usage due to the large data volume. This study proposes a multi-path management method for redundant transmission suitable for blockchain P2P networks by integrating a software defined network (SDN). Experiments show that the method improves the efficiency of block-synchronised data transmission, reduces the streaming table consumption by 12.5%, and improves the throughput by a factor of 2 compared to the traditional method.