基于双区块链的医疗记录安全存储与共享方案

在当前的医疗信息化建设中，电子医疗记录的存储与共享给病人带来了隐私泄露的风险，从而造成名誉损害和财产损失。现有的多数保护隐私的医疗记录存储与共享方案使用了中心化的管理节点，容易遭受集中攻击导致单点失效和恶意篡改的威胁。针对这些问题，设计了一个双区块链结构的医疗记录安全存储与共享方案 EMRSBC，其中使用2条联盟链分别用于医疗记录存储与共享。该方案解决了传统单链应用中拓展性差、吞吐量低的问题，将医疗记录的共享与存储分开，利用区块链的去中心化特性以及智能合约的链上代码实现在不可信环境中的访问控制，有效地保护了病人的隐私数据在存储与共享过程中的安全性。

A secure medical record storage and sharing scheme based on dual-blockchain

In current medical informatization construction, the storage and sharing of electronic medical records (EMRs) incurs the risk of privacy leakage of patients, resulting in the loss of reputation and property. Currently, centralized management nodes are used in most medical record storage and sharing schemes for privacy preservation, which is vulnerable to the threat of single-point failure and malicious tampering caused by concentrated attacks. In response to these problems, we design a medical record storage & sharing scheme based on dual-blockchain structure, called electronic medical records share & storage blockchain (EMRSBC). It adopts two consortium chains for medical record storage and sharing, which solves the problems of poor scalability and low throughput in traditional single-chain applications. It also separates the sharing and storage of medical records, and utilizes the decentralization feature of the blockchain and the chain code of the smart contract to achieve access control in an untrusted environment, which prevents the privacy data of patients from leaking during storage and sharing.