Reducing Block Propagation Delay in Blockchain Networks via Guarantee Verification

With the development of blockchain technology, people always expect that blockchain can be applied to other fields. However, the low Transaction Processing Speed (TPS) and broadcast delay of blockchain still restrict the application of blockchain. To solve these problems, we propose a new scheme named GVScheme to improve the scalability of blockchain network. GVScheme introduces the role of guarantor based on trust value mechanism. The guarantor node will guarantee the block spread in the network. When the node receives the guarantee block from the guarantor node, the order of verification block and propagation block will be determined according to the trust value of the guarantor. By reducing the block verification time, the block propagation delay in the network will also be reduced. It is worth mentioning that our scheme keeps the minimum modification to the blockchain, and may even be directly applied to the blockchain network. Simulation results show that GVScheme can effectively reduce block propagation delay and the fork rate in blockchain network. When the block size and the number of nodes increase, GVScheme also shows great performance. Thus, under the same fork rate, the blockchain using GVScheme can allow less mining interval and larger block size limit.