1        Introduction  
2        Types of healthcare data systems and managing institutions  
3        Healthcare data related services  
4        Security issues in conventional healthcare data storage systems  
5        Types of security parameters vis-à-vis healthcare sector  
6        Blockchain components and properties for improvement in data security  
7        Blockchain for improvement in healthcare data security  
8        Technical limitations in the implementation of blockchain in healthcare  
9        Regulatory challenges for blockchain in healthcare data security  
10        Blockchain role in pandemics like COVID-19 for large-scale data security and management  
11        Conclusion and Perspective on Future Research Directions