• Parvathy Viswanath

A block chain can be defined as a distributed technology that is associated with bitcoins and they can form a chain of blocks. Here each block contains information and data which are packed together and they are also verified. Blocks are validated and they are added to the chain in previous blocks. This technology is having numerous benefits like decentralization , anonymity , audibility and it has been used in many areas like financial services , risk management , Internet of things , cryptocurrency etc. This paper deals with both technological and application perspectives of block chain. Introduction to block chain consensus algorithms, technical challenges and some recent solutions to tackle these challenges area also discussed here.

Block chain, cryptocurrency, bitcoin, consensus algorithm

"A Scrutiny on opportunities and challenges of block chain", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.8, Issue 9, page no.e243-e247, September-2021, Available :http://www.jetir.org/papers/JETIR2109428.pdf

"A Scrutiny on opportunities and challenges of block chain", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.8, Issue 9, page no. ppe243-e247, September-2021, Available at : http://www.jetir.org/papers/JETIR2109428.pdf