Analysis on Blockchain Vulnerabilities & Attacks on Wallet

Blockchain is considered one of the Secured systems even it has flaws and Vulnerabilities which leads to big threats, steal of cryptocurrencies through hackings. Many Big organizations witnessed these threats which cost them shutdown the companies. Whether its Public or Private blockchain both have recently subjected to attacks and identified to be ineffective in certain situations. Significant development has been remarked recently to provide robust solution for Blockchain vulnerabilities. We survey some of attacks occurred on blockchain systems from last few years and also analyse some of these vulnerabilities. We also tried to cover or summarize some of academic achievements done for the enhancement of Blockchain Security. Our main focus on the blockchain vulnerabilities occurs in wallets or smart contracts.