AcquainLay: An Efficient Blockchain Block Relay Method Based on Acquaintance Immunization

The propagation of information in blockchain plays a key role in its scalability improvement, and it is difficult to maintain the original decentralized characteristics and security in the existing methods of accelerating block propagation. In this paper, we combine blockchain and complex network epidemic immunization strategies and then propose an approach (Acquain-Lay) based on acquaintance immunization to find suitable nodes to disseminate information without the need for global topolog-ical information. The evaluation results show that AcquainLay improves transaction throughput by 43.53 % at best and reduces the orphan block rate significantly. In addition, AcquainLay is easy to deploy because it does not change the key data structures and network topology of the blockchain.