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 ?...
Blockchain technology probably no, but it can be adjusted to it, thereby constantly making some exchanges bankrupt. But from such holes, if it can be defended, it is not at this stage.