Blockchain-Based Data Storage Model For Supply Chain Finance

Financial data is critical basis for companies to obtain financing in the supply chain system.The existing supply chain system adopts a centralized management model,and the data may be attacked accordingly,so it is a great challenge to build a credible data storage platform.Blockchain is a decentralized distributed database with the characteristics of decentralization,tamper-proof and traceability,which is widely used in the financial and physical fields.In this thesis,blockchain technology is introduced in supply chain finance data storage to ensure the security of supply chain finance data.However,blockchain technology suffers low efficiency and high resource consumption,which can hardly meet the application demand for efficient storage of supply chain systems.Therefore,how to improve the storage efficiency of blockchain and make it applicable to supply chain finance data storage has certain application value and is of great significance to the improvement of blockchain performance.In recent years,there has been an increasing amount of research around supply chain and blockchain,but most of the existing research focuses on product traceability,anti-counterfeiting and data sharing,and there is still inefficiency in supply chain finance data storage.Therefore,this thesis proposes a blockchain-based data storage model for supply chain finance data storage,and improves the blockchain storage efficiency by two methods: on-chain and off-chain storage methods,and improved Practical Byzantine Fault Tolerance(PBFT)consensus algorithm,respectively.Specifically,the contributions of this thesis include:(1)In response to the demand for secure and efficient storage of finance data in the supply chain system,a blockchain-based supply chain finance data storage model is proposed,using on-chain and off-chain storage methods,and a smart contract-based storage and access algorithm is designed.Experimental results show that the model is more efficient than on-chain storage approach in terms of throughput and latency.(2)Aiming at the matter of low consensus efficiency of PBFT consensus algorithm in the application scenario of consortium chain for supply chain finance data storage,a tree-structured PBFT is proposed as the consensus algorithm used in the model,and the tree network topology,consistency protocol and view replacement protocol in the consensus algorithm are given.The experimental results show that the consensus algorithm proposed in this thesis is more efficient than the PBFT algorithm in terms of throughput and consensus delay,and has better scalability.(3)For the field of pharmaceutical supply chain,a financial data storage system for pharmaceutical supply chain is designed and developed based on the model proposed in this thesis.The system is divided into blockchain storage module and IPFS storage module,providing a trusted data storage platform for each participant in the pharmaceutical supply chain system.