Supply Chain Data Storage and Cross-domain Access Proposal under Blockchain Architecture

In recent years, supply chain applications using blockchain as a data storage platform have become a popular research area. However, the existing research based on a single blockchain network faces performance bottlenecks such as poor scalability and low throughput as the scale of supply chain data increases. To address the above problems, firstly, a supply chain data sharing model with master-slave multi-chain architecture is constructed to relieve the pressure on the master chain by introducing multiple slave chain networks; secondly, a ‘split-chain + on-chain + off-chain’ storage strategy is adopted, where the sensitive data is only stored in the blockchain with its hash address, thus reducing the amount of data on the chain; finally, a cross-domain data access and authentication model is proposed for this model. Finally, a cross-domain data access and authentication scheme is proposed for this model, which adopts the ciphertext policy attribute-based encryption algorithm (CP-ABE) to realise the fine-grained access of intra-domain and cross-domain sensitive data and avoid the risk of privacy leakage. The security analysis and experimental simulation show that the scalability and privacy protection of this model are better than the traditional single-chain architecture, and the network throughput is greatly improved, which can be applied to supply chain big data scenarios.