According To expect they always say blockchain can never be hacked and your information can never be stolen .. But day in day out Hacker are hacking crypto exchanges to steal people asset , ETH Suspended hard Fork because of security reason . HitBTC and Cryptopia are understand maintenance because of hacker . Are they Using block-chain technology to deceive Us ?...
Yea, thats right, for now blockchain can't be hacked. But exchanges it's only a platform, which keep private keys of their blockchain addresses. And many of them do not pay serious attention for security of their platforms.