A Review of Blockchain-Based Secure Sharing of Healthcare Data
Round 1
Reviewer 1 Report
The authors discuss some interesting issues regarding blockchain in the field of healthcare from a security-aware perspective. The topic is current and interesting. However, authors should include a paragraph to explain the paper's contribution in comparison with other existing reviews in the field. Also, a more explicit reference to real world use cases will be a plus.
Author Response
Dear reviewer, please see the attachment.
Author Response File: 
Author Response.doc
Reviewer 2 Report
This article provides an overview of blockchain-based technologies for sharing and storing medical data and briefly describes them. The topic of this article is definitely relevant and interesting. However, in this article, it is not entirely clear what the novelty is. The current state of the work is unacceptable, and major changes are needed to improve its quality.
The title of this manuscript is "A Review of Blockchain-Based Secure Sharing of Healthcare Data", but the article itself lacks a critical and more detailed review of existing methods or solutions. It is worth paying more attention to the first section and emphasizing what the novelty of this article is. The relevance of the problem and the topic to be addressed in the article should be more clearly defined. The article should pay more attention to the problem under study, describing in more detail what problem the authors are trying to solve and what possible solutions exist. Maybe you should look at the problem more broadly, as well as expand the list of references used.
Section 3.1 and Table 2 present methods and solutions for secure blockchain-based data storage and access. The text indicates that the results of the comparison of different models are shown in Table 2. However, the information provided is not the results of the comparison, lacking a more detailed comparison of the different criteria. Perhaps a more critical review should be added, highlighting the advantages and differences of the methods under consideration. The same applies to section 3.2, and the information presented in Table 3. Also, the meaning of the "yes" criterion is not quite clear.
Figure 4 is worth explaining in more detail.
It would also be good to extend the conclusions , add criticism and analytical conclusions. In your conclusions, state the most important result of your work.
Other remarks:
· “The first paragraph introduces the research background and the significance of this paper. The second paragraph introduces the basic concept of blockchain…” (lines 31-36) – it may be more correct to use the term "section" instead of "paragraph.
· “A blockchain-based ’medcichain’ model was proposed by Rahul et al.[15].” (line 96) - incorrect spelling of 'medcichain'
· “An interface is provided in the system proposed by the authors10” (lines 167-168) - is not quite clear on the meaning of this statement.
Author Response
Dear reviewer, please see the attachment.
Author Response File: Author Response.doc
Round 2
Reviewer 1 Report
Some work towards the enhancement of the paper has been made, but some more work is needed.
For example, considering the new paragraph that presents some real world approaches (lines 28-34) the refs are missing. Also, a greater analysis of those solutions would be beneficial. What is more, section 4 could include a greater analysis.
Also, the paper needs to be checked considering the use of the English language, as the authors have been in a hurry to review the paper, several words have been written incorrectly.
Author Response
Please see the attachment
Author Response File: Author Response.doc
Reviewer 2 Report
The authors have made some changes to the article according to the comments. I would have liked the novelty of the article and the topic to be covered in more detail. Nevertheless, the topic of the article is quite interesting, and some improvements were made to make it more interesting and informative for the reader.
In future works I would advise to pay more attention to critical analysis, description of already existing methods and solutions, as well as to present the problems in more detail.
Author Response
Please see the attachment
Author Response File: Author Response.doc
