Electronic Health Records (EHRs) have undergone numerous technical improvements in recent years, including the incorporation of mobile devices with the cloud computing technologies to facilitate medical data exchanges between patients and the healthcare professionals. This cutting-edge architecture enables cyber physical systems housed in the cloud to provide healthcare services with minimal operational costs, high flexibility, security, and EHR accessibility. If patient health information is stored in the hospital database, there will always be a risk of intrusion, i.e., unauthorized file access and information modification by attackers. To address this concern, we propose a decentralized EHR system based on Blockchain technology. To facilitate secure EHR exchange across various patients and medical providers, we develop a reliable access control method based on smart contracts. We incorporate Cryptocurrency, specifically Ethereum, in the suggested system to protect sensitive health information from potential attackers. In our suggested approach, both physicians and patients are required to be authenticated. Patients can register, and a block with a unique hash value will be generated. Once the patient discusses the disease with the physician, the physician can check the patient's condition and offer drugs. For experimental findings, we employ the public Block chain Ganache and solidity remix-based smart contracts to protect privacy. Ethers are used as the crypto currencies.

翻译：电子健康记录近年来经历了多项技术改进，包括将移动设备与云计算技术相结合，以促进患者与医疗专业人员之间的医疗数据交换。这一前沿架构使云托管的信息物理系统能够以最低的运营成本、高灵活性、安全性和电子健康记录可访问性提供医疗服务。若患者健康信息存储在医院数据库中，始终存在入侵风险，即攻击者未经授权访问文件并修改信息。为解决此问题，我们提出一种基于区块链技术的去中心化电子健康记录系统。为促进不同患者和医疗服务提供者之间的安全电子健康记录交换，我们开发了一种基于智能合约的可靠访问控制方法。我们在建议系统中引入加密货币（特别是以太坊），以保护敏感健康信息免受潜在攻击者侵害。在我们提出的方法中，医生和患者均需进行身份认证。患者可进行注册，并生成具有唯一哈希值的区块。当患者与医生讨论病情时，医生可检查患者状况并提供药物。在实验过程中，我们采用公共区块链Ganache和基于Solidity Remix的智能合约来保护隐私，并使用以太币作为加密货币。