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Blockchain is one of the wonderful technologies which is used in the next decade and taken a huge variety of uses with it. Most of the researches are carried out to identify the advantages of Blockchain. Blockchain is decentralized in nature. Blockchain is considered has the security mechanism to shield the privacies of the objects to access through mobile devices. Blockchain is used in many applications, they are banking applications, e-voting applications and digital forensic programs and healthcare data sharing. This paper gives a comparative look of blockchain and additionally explains the taxonomy and architecture of blockchain, explains an evaluation among different consensus mechanisms. It is guaranteed that safe sharing of healthcare data is achieved by utilising the programs of blockchain for the shipping of secure healthcare data. Blockchain is the conforming healthcare practices to a greater dependable means, and remedy through safe and comfortable healthcare data sharing. In future, blockchain can help in bespoke, proper, and comfort healthcare by way of merging the complete actual-time clinical statistics of a patient's health and presenting it in an up-to-date healthcare setup. This article gives an updated survey on different situations, open troubles encountered in healthcare due to the legacy security features along with the security necessities of such situation. It also merges the strengths of blockchain as a trusted security degree, highlights capability challenges inside the healthcare field, and presents an investigation of various blockchain-based safety algorithms. [ABSTRACT FROM AUTHOR]

Blockchain is the underlying technology of a number of digital cryptocurrencies. Blockchain is a chain of blocks that store information with digital signatures in a decentralized and distributed network. The features of blockchain, including decentralization, immutability, transparency and auditability, make transactions more secure and tamper proof. Apart from cryptocurrency, blockchain technology can be used in financial and social services, risk management, healthcare facilities, and so on. A number of research studies focus on the opportunity that blockchain provides in various application domains. This paper presents a comparative study of the tradeoffs of blockchain and also explains the taxonomy and architecture of blockchain, provides a comparison among different consensus mechanisms and discusses challenges, including scalability, privacy, interoperability, energy consumption and regulatory issues. In addition, this paper also notes the future scope of blockchain technology.