Block chain and health application

Since many transactions in the world are now digitalized, data security, data sharing, fast access to data and maintaining data integrity are considered extremely important. With each passing day, it is mentioned that the dependency on computers in daily life and parallel to this dependency, the data increase exponentially in digital media. The importance of ensuring the secure sharing of this data is increasing day by day. It is extremely important to protect and preserve the security of this data. In recent years, the word blockchain has been heard frequently in terms of data security. Blockchain is defined as a decentralized digital ledger tasked with maintaining secure data sharing and data integrity. Blockchain realizes data transfer according to the principle of transparency, which records data unidirectionally, which is impossible to reverse engineering, and whose sharing is transparent. It is said that the blockchain is the general name of the technology that enables the common data sharing of these recorded data and shortens the time to reach the data responsible for protecting data security. Theft and alteration of patients' medical record information poses various risks to the privacy of patients. The harm that this information will cause by malicious people causes serious harm to both the patient and the financing institution. Therefore, cloud-based EHR (electronic health records) is becoming a focal point in many healthcare fields. Storing patient data, ensuring data accuracy, protecting data confidentiality, and providing fast transmission of data in the cloud system is becoming a major concern in the healthcare industry. In this thesis, while providing data access control and control for EHR records, layered architecture in addition to blockchain is also discussed for sharing health data with the help of cloud service providers. In order to enter this layered architectural system, JWT (json web token), patient information hashing function, supporting new additional solutions are proposed. With this proposed method, it is used to manage and control the patient's health records electronically. Therefore, with these technologies used in the blockchain platform, more secure and sustainable new doors are opened.