## 6 Conclusions and Future Work  
Although many systems for online record sharing exist, including medical data sharing, most of these are designed either for a specific location, region, or institute, such as a hospital, or do not meet the expected security levels. Most global communications systems are centralized. However, with the advent of the blockchain in cryptocurrency, many fields are attracted toward the idea of decentralization and the benefits provided by customized changes. Blockchain technology has advanced the information technology industry. In this study, a revolutionary blockchain technology was proposed for use in the medical communication field, and a global health record exchange system that is not dependent on the location of the user was created for the transfer of medical data. Using blockchain technology and the Shibboleth federated identity management system, the proposed system performs authentication of the users and the person requiring users' information, under the guidance and support of Health Level Seven standards. The proposed system ensures that a patient is able to provide their medical information to any healthcare worker around the world, without any risk of the data being leaked or hacked.  
The system provides appropriate security for all of the stakeholders present in the consensus, and stores each copy of their transaction or data in their home station network. The data shared with the remote country or location is temporary and deleted after a certain period of time or according to the user's requirement; however, every record is maintained in the ledger of the network to maintain the integrity of the data. Blockchain technology is currently penetrating almost every field and shows promise for future applications. However, in this study, it is only used to enable secure data communication in healthcare. In the future, this work can be expanded to add other medical aspects, such as doctors' prescriptions, pharmacy transactions, and vendors' purchases and sales. These additional topics require further research.  
Conceptualization, T.A.S.; Formal analysis, G.Q.B.; Funding acquisition, A.P.; Investigation, G.Q.B.; Methodology, T.A.S.; Project administration, R.R.; Resources, R.R. and S.S.R.; Software, G.Q.B.; Supervision, R.R.; Validation, T.A.S.; Visualization, G.Q.B.; Writing--original draft, G.Q.B. and T.A.S.; Writing--review & editing, R.R., S.S.R. and A.P. All authors have read and agreed to the published version of the manuscript.  
This research work was supported by the National Research Foundation of Korea (NRF) grants funded by the Korean government under reference number (2020R1A2C1012196).  
Not applicable.  
Figure 13: Comparison of the delay against the number of requests.  
Data Availability Statement: Not applicable.  
**Acknowledgments:** Special acknowledgement to [PERSON] for his help and guidance during the research work. We would like to thank HED AJK for the utilization of their servers for testing. We would like to acknowledge the Deanship of research, Islamic University of Madinah for their support in all aspects of completing this research.  
The authors declare no conflict of interest.