• B Sri Harsha Vardhini
• Priyanka kumari Bhansali

With the enhanced iteration of technological innovation, blockchain has rapidly become one of the hottest Internet technologies in recent years. As a decentralized and distributed data management solution, blockchain has restored the definition of trust by the embedded cryptography and consensus mechanism, thus providing security, anonymity and data integrity without the need of any third party. But there still exists some technical challenges and limitations in blockchain. Bitcoin is a popular cryptocurrency that records all transactions in a distributed append-only public ledger called blockchain. In this paper, we present a systematic survey that covers the security and privacy aspects of Bitcoin. We start by presenting an overview of the Bitcoin protocol and its major components along with their functionality and interactions within the system. We review the existing vulnerabilities in Bitcoin and its underlying major technologies such as blockchain. This paper has conducted a systematic research on current blockchain application in cybersecurity. In order to solve the security issues, the paper analyzes the advantages that blockchain has brought to cybersecurity and summarizes current research and application of blockchain in cybersecurity related areas. Through in-depth analysis and summary of the existing work, the paper summarizes four major security issues of blockchain and performs a more granular analysis of each problem. Finally, we summarize the critical open challenges and suggest directions for future research towards provisioning stringent security and privacy techniques for Bitcoin

Block chain, Cybersecurity, Privacy-Protection, Bitcoins, Cryptocurrency ECC, SHA

"Leveraging Blockchain technology on bitcoin from Cyber-Security Issues", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 10, page no.466-473, October-2018, Available :http://www.jetir.org/papers/JETIR1810850.pdf

"Leveraging Blockchain technology on bitcoin from Cyber-Security Issues", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 10, page no. pp466-473, October-2018, Available at : http://www.jetir.org/papers/JETIR1810850.pdf