## 2 Literature Study
These issues were the security of the medical data of the patients, the transparency of the communications between different entities, the accessibility of the data, etc., and the authors discussed blockchain-based solutions to address these issues [24]. Breaches of patient information such as names, addresses, and other personal information were common, according to the authors. They proposed a blockchain-based system for dealing with medical records. The major resolution of their work was to evaluate the performance of their system in order to assess how well their suggested framework handled the demands of patients, physicians, and third parties [25]. The authors proposed a book chapter in which they examined several healthcare blockchain application cases. They have emphasized the need for a blockchain-based healthcare system and how this technology may help with medical system design [26]. The authors discussed how distributed ledger technology might help the medical industry by simplifying procedures. They have indicated in their study that keeping healthcare records is critical, and that technology has the ability to decrease data loss and avoid data fabrication by safeguarding information [27]. [PERSON] et al. explored medication restrictions and how to standardize pharmaceuticals by utilizing blockchain technology. They have underlined the difficulty in detecting fake pharmaceuticals in their study and advocated blockchain as a method for detecting counterfeits [28]. Using a blockchain and a microscope sensor, [PERSON] and [PERSON] developed a fingernail analysis management system. Human nails are one of a kind and represent a person's physiological makeup. They employed minuscule sensors to capture nail pictures and pre-processing methods to produce clear photos in their research. The performance of a feature extraction technique was monitored using a deep neural network. Blockchaintechnology was employed to safeguard user data, offer security and privacy, and track and record any changes in the system via the ledger [29]. The authors investigated a thorough analysis of existing blockchain applications in the domain of healthcare. Their research demonstrated that distributed ledger technology can be the perfect fit for many medical applications. They also suggested that better knowledge of this technology can open up new research directions in the healthcare domain. Healthcare innovation has been delayed by inefficiency and stringent restrictions [30]. The regulatory difficulties that produce inefficiencies in the EMR system were explored by the authors. They have presented a distributed-ledger-supported solution to handle massive amounts of medical data. They have exhibited a new and inventive way for gaining access to medical records that includes a fair audit log system. Using distributed ledger technology, MedRec allowed patients and clinicians to exchange medical data with other parties. They provide incentives for people such as researchers and other health professionals to engage in the mining process [31]. The authors talked about the use of distributed ledger technology to solve a variety of issues in the medical domain. Multiple issues related to the privacy and security of medical data can be tackled with this technology. They went on to say that by creating blockchain-supported applications, they can more effectively handle healthcare challenges [32]. The authors highlighted the use cases of distributed ledger technology in the domain of the healthcare industry. They have identified the various hurdles in the adoption of distributed ledger technology. They also developed smart contracts for the management of medical systems [33]. The authors advocated distributed ledger technology as the safest way to manage data related to the healthcare domain. As per their survey, due to hacker motivations and secrecy violations, digital safety was a serious concern.