• Bonagani Prathusha
• Dr G Bindu

Blockchain has become a novel technology which has been utilized to provide innovative results across a wide range of sectors. A decentralized blockchain system is used in fields other than finance. Moreover, we can also design a transaction that’s compatible with any requisition. If we consider medical field, the network known as blockchain is used for storing and exchanging clinical information across medical centres, laboratories for diagnosis, pharmaceutical business and medical professionals. Blockchain consists of multiple application likewise IOT. In IOT wireless gadgets and sensors deployed in healthcare systems constantly track and communicate information to adjacent devices or servers over an unprotected public channel. It also provides an enormous amount of opportunity for intruders for carrying out numerous cyber-attacks that might harm victims under crucial observation. Blockchain based methods are capable of accurately identifying major errors in the medical profession, even possibly fatal ones. This research article provides a detailed anatomy of blockchain technology with its categories. This investigation explores distributed ledger, consensus mechanism algorithm and its types, smart contracts along with Ethereum working architecture, security mechanisms. In future, research outline delivers security and privacy concerns with more accuracy related to blockchain.

Blockchain, IOT, distributed ledger, consensus mechanism, smart contracts, Ethereum.

"A Survey on comprehensive Blockchain Technologies with Recent Affinities ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.10, Issue 12, page no.f264-f276, December-2023, Available :http://www.jetir.org/papers/JETIR2312530.pdf

"A Survey on comprehensive Blockchain Technologies with Recent Affinities ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.10, Issue 12, page no. ppf264-f276, December-2023, Available at : http://www.jetir.org/papers/JETIR2312530.pdf