Research On Data Traceability Method Of Pharmaceutical Logistics Based On Blockchain

With the rapid development of Chinese pharmaceutical industry,the need for pharmaceutical logistics data traceability is increasing,and it has become an inevitable trend for the development of pharmaceutical industry to build a whole-process traceability system.Due to the special properties of drugs,they have high storage environment requirements,strong transportation efficiency and need to accept strict policy supervision.However,the existing traceability system has the problems of low traceability efficiency and high data risk.Blockchain has the characteristics of immutable data,transparency and traceability,which is suitable for the application scenarios of data traceability.This thesis studies the traceability of medical logistics data based on blockchain,and the specific work is as follows:(1)Propose a Raft consensus mechanism based on historical behavior analysis of medical nodes.The scoring mechanism of medical nodes was designed and the main node election process was improved according to the scoring,and medical nodes were encouraged to actively participate in data tracing.Online sequential extreme learning machine was used to learn the behavior of pharmaceutical nodes and forecast the current score.According to the predicted results,the corresponding preoperation processing was carried out to improve the efficiency of pharmaceutical logistics data traceability.(2)Propose data index and security traceability method based on Inter Planetary File System.To encrypt pharmaceutical logistics data,establish ciphertext index and store encrypted data in distributed storage system to ensure data storage security;Save data summary information in blockchain and build Merkle mountain data structure to quickly verify data ownership and improve query efficiency;The key and index required for decrypting data are distributed through secret sharing to ensure the security of data sharing.(3)Design and implement a medical logistics data tracing system based on blockchain.The business requirements of the traceability system are analyzed,the overall architecture of the system is designed,and the realization and display of each functional module of the system are completed,which verifies the feasibility of the data traceability system based on blockchain to meet the requirements of pharmaceutical logistics data traceability.