Health data is usually in a scattered manner as they are usually gathered by various entities. The data’s scatteredness develops a burden in designing adequate health bills which ensure the well-being of the patients. Moreover, the concerns in achieving synchronization and instantaneous access to such data worsens the problem all the more. So, designing a system that can ensure the integrity, security, preciseness, and accessibility of the patient’s medical data is of paramount importance. Health systems based on blockchain can guarantee the above features and protect data from being tampered or from any kind of attacks. Blockchain also helps in management of data and its flawless integration. It makes most of its smart contracts feature to execute the several requests and queries related to the patients (medicine, appointments, medical procedures, lab tests or previous medical information). All the stakeholders in the system should be able to obtain the medical data preserved in a database not having to compromise on its credibility. In this survey, we examine the previous research work various authors have carried out on implementing blockchain in several aspects of healthcare.

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