In healthcare systems IoT device has to give sensitive and private information about the patients, it should be maintained extremely confidential and personal. Most of the IoT-healthcare devices based on existing centralized server data management technology don’t give any guarantee of authenticity and security. Blockchain is a public tamperproof ledger that is decentralized network system in which transaction of data is distributed among the nodes. Blockchain with its consensus algorithm can solve problems by providing decentralized computation for IoT data. The combination of IoT and blockchain technologies with consensus algorithm can become a best choice of designing the secured distributed e-healthcare systems. This paper reviews the blockchain technology and the basic principle and characteristics of a consensus algorithm for IoT- based e- healthcare system.

在医疗保健系统中，物联网设备必须提供有关患者的敏感和私人信息，应将其高度机密和个人化。大多数基于现有集中式服务器数据管理技术的IoT保健设备都无法提供真实性和安全性的任何保证。区块链是一个公共的防篡改分类账，是一种分散的网络系统，在该系统中，数据交易在节点之间进行分配。区块链及其共识算法可以通过为物联网数据提供分散式计算来解决问题。物联网和区块链技术与共识算法的结合可以成为设计安全的分布式电子医疗系统的最佳选择。