BSS-ITS - Blockchain Scaling Scheme with Sharding for Intelligent Transportation System - Scale Blockchain for Better Data Exchange and Storage with Full Sharding for Intelligent Transportation System.

With the development of modern technologies, Intelligent Transportation System (ITS) has made great progress and brought convenience to every aspect of people's lives. ITS has become more complicated and uncertain due to the existing security and privacy problems. Blockchain, being a decentralized and tamper-resistant technology, can provide an environment for ITS, allowing ITS entities to perform transactions securely and trustfully. However, the inefficiency problem of blockchain, severely restricts its development and application. Studies only combine traditional blockchain with ITS, but do not consider scaling blockchain to improve performance. This paper devotes to scale blockchain that adapted to ITS, improving the efficiency of the blockchain without sacrificing the decentralization and security. A sharding scheme is proposed, which takes network sharding, data sharding and state sharding into account. Nodes are divided into several shards. Different shards can process data in parallel and store related data in their own ledger. Backup shard is put forward in this paper to enhance the shard security. And network will reshuffle when one or more shards break down. Some experiments are performed using Hyperledger Fabric and network simulator 3. Throghput, storage and delay are tested under sharding scheme and non sharding solution. The results show that sharding method is effective in scaling blockchain for ITS.