{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"Where are the bottlenecks in blockchain security?","a":"Smart contract vulnerabilities: Smart contracts on the blockchain are an important part of carrying business logic, but their security often depends on the programming language and the ability of developers. If there are vulnerabilities in smart contracts, they may lead to  hacker attacks and thereby affect the security of the blockchain."}]}],"pr":"689641d0a50af4ff067479e266083e4e1dd0d09a999eec82e268f7b36fc1d498"}