A Review on Secure Data Storage and Data Sharing Technics in Blockchain-based IoT Healthcare Systems

Transmitting and maintaining integrity in the storage and sharing of healthcare data are essential issues. In recent years, a considerable amount of literature has been published on the storage and sharing of healthcare data. Therefore, there has been being a growing body of literature in this field. The advent of blockchain has provided a secure platform for storing and sharing data, therefore, blockchain has been used in healthcare systems. Although some blockchain-based IoT healthcare systems have been implemented on the smart contract platform, due to the special properties of these systems, general smart contracts have been not met their requirements. So, in recent years, some IoT healthcare systems are going to design and develop their blockchain networks. Therefore, in this article, we will have an extensive review on secure data storage and data sharing technics in blockchain-based IoT healthcare systems. We categorized them into two categories: 1) blockchain-based IoT healthcare systems on smart contract platforms and 2) designing blockchain-based IoT healthcare systems. Attributes and challenges of these systems are investigated that are consisted of security criteria, consensus algorithms, and implementation tools. Therefore, in recent years, the blockchain-based IoT healthcare systems have tended to focus on designing their blockchain networks rather than using smart contract. To achieve this aim, a trade-off is required between security criteria, consensus algorithm, and implementation platform.