With the development of the electronic healthcare industry, telemedicine diagnosis (TMD) has become a more flexible and convenient way. In the general remote diagnosis scheme, the collected medical data is stored in the cloud which may be leaked or tempered with. Since blockchain has the characteristics of centralized storage, some schemes employ blockchains to overcome the security problem of cloud storage, but most of them lack a supervision mechanism. The identity information provided by the doctor to the user must be accurate. However, the digital certificate issued by the certificate authority (CA) may have the problem of information update latency. To solve the above questions, we propose DBTMD, a TMD privacy protection scheme based on double blockchain. We have constructed two types of blockchains, Userchain and Medicalchain, and designed five transactions. Users, doctors, and hospitals can implement secure data interaction, and hospitals can supervise doctors effectively. We have developed an identity authentication chain to ensure the real-time accuracy of the doctor’s identity information. Security analysis and experimental analysis show that our scheme greatly reduces the communication costs of keys’ transaction compared with existing schemes.

随着电子医疗行业的发展，远程医疗诊断（TMD）已成为一种更加灵活便捷的方式。在一般的远程诊断方案中，采集到的医疗数据存储在云端，可能会被泄露或篡改。由于区块链具有中心化存储的特点，一些方案采用区块链来克服云存储的安全问题，但大多缺乏监管机制。医生向用户提供的身份信息必须准确无误。但是，由证书颁发机构（CA）颁发的数字证书可能存在信息更新延迟的问题。针对以上问题，我们提出DBTMD，一种基于双区块链的TMD隐私保护方案。我们构建了两种类型的区块链，Userchain 和 Medicalchain，并设计了五个交易。用户、医生和医院可以实现安全的数据交互，医院可以有效地监督医生。我们开发了身份认证链，保证医生身份信息的实时准确。安全性分析和实验分析表明，与现有方案相比，我们的方案大大降低了密钥交易的通信成本。