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| S. no. | Title of the paper | Brief description | Year |
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| 1 | A blockchain-based electronic medical health records framework using smart contracts [166]. | The purpose of the study was to implement infrastructure to access smart contracts. | 2021 |
| 2 | Semicentralized blockchain based distributed system for secure and private sharing of electronic health records [167]. | The study throws light on the usage of decentralized systems data storage model in a centralized system for allowing data reproducibility. It also uses the blockchain for providing security to the patient’s data. | 2021 |
| 3 | BlockHealth: blockchain-based secure and peer-to-peer health information sharing with data protection and right to be forgotten [168]. | The BlockHealth solution ensures the secured communication of personal health data. The hash values of the data are being stored. The companies manage the health data in private databases which permits to delete data in compliance with the right to be forgotten. | 2021 |
| 4 | Framework to enable pharmacist access to health care data using blockchain technology and artificial intelligence [169] | The purpose is to integrate blockchain and AI for enabling the pharmacist to access to health data. | 2021 |
| 5 | Blockchain technology and universal health coverage: health data space in global migration [170] | The blockchain can empower in real time multiorganizational services and workflows among multiple users anywhere in the national healthcare systems around the world as it is anchored in the security, privacy, and medico-legal regulation of medical data. This is an innovative approach highlighting possible future directions in IT-supported health. | 2022 |
| 6 | Blockchain’s coming to hospital to digitalize healthcare services: Designing a distributed electronic health record ecosystem [171] | The information processing theory (IPT) may enable design and validation of a blockchain-based EHR system. This can increase the storage of medical records and data exchange among healthcare providers. Few of the benefits in implementing a distributed network are improved quality, reduced medical errors in clinical domain, financial, and operational benefits. | 2022 |
| 7 | Blockchain-based governance models for COVID-19 digital health certificates: a legal, technical, ethical, and security requirements analysis [172] | The focus of this study is to analyze the requirements of a blockchain-based data governance model for COVID-19 digital health certificates. The authors discovered loss of the main advantages of blockchain in this model i.e., decentralization and anonymity. | 2022 |
| 8 | Is blockchain the solution to the challenges of reliable interoperability in the healthcare ecosystem? [173] | Health standards and smart contracts are some of the most challenging issues facing the interoperability of healthcare systems. This paper highlights issues for the interoperability of healthcare systems using blockchain technology. The authors try to identify a solution from a software engineering domain for this. | 2022 |
| 9 | Improved security blockchain for IoT-based healthcare monitoring system [174]. | The authors aim to reduce required bandwidth and increase efficiency of data security and privacy. To this end, they use a technique called enhanced proof of work (E-PoW) consensus blockchain. This may be used for IoT-based healthcare monitoring system. | 2022 |
| 10 | Task offloading strategy with emergency handling and blockchain security in SDN-empowered and fog-assisted healthcare IoT [175]. | The paper has a task offloading strategy with low-latency, centralized, reliable, and secure decision-making algorithm. It is also having a powerful emergency handling capacity (LSRDM-EH) and used in resource-constrained edge devices for task offloading. In order to provide security to the complete network, a blockchain-based, two-layer, multidimensional security strategy is mentioned. | 2022 |
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