基于区块链的电子健康记录安全存储模型

针对现有中心化信任背景下电子健康记录存储存在的安全风险，提出一种基于区块链的电子健康记录安全存储模型。模型首先设计了新的电子健康记录区块链存储结构，解决了现有存储模型实用性不强的问题；然后优化了区块链中区块入链的工作流程，减少了点对点（P2P）网络中的信息传播量；最后设计了基于随机数选举的共识机制，提高区块入链的时间效率。将提出的模型在Hyperledger中进行模拟实验，并将所提出的共识机制与现有共识机制进行性能对比。实验结果表明，提出的存储模型具有较高的安全性和更好的运行时间效率。该模型适用于区块链在医疗卫生领域的应用，为电子健康记录的安全共享提供了支撑。

Secure storage model of electronic health records based on blockchain

In order to solve the security risk of electronic health record storage in the context of centralized trust,a secure storage model of electronic health records based on blockchain was proposed. Firstly,a new blockchain storage structure for electronic health records was designed,which solved the problem that the existing storage model was not practical. Then,the workflow of block addition in blockchain was optimized,and the information transmission amount in the Peer to Peer(P2P)network was reduced. Finally,a consensus mechanism based on random number election was proposed to improve the time efficiency of block addition in blockchain. Simulation experiments in Hyperledger were carried out to test the proposed model,and the performance comparison between the proposed consensus mechanism and the existing consensus mechanisms was performed. Experimental results show that the proposed storage model has high security and running time efficiency. This model is suitable for the applications of blockchain in healthcare field and provides a support for the safe sharing of electronic health records.