{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the vulnerabilities and security issues of blockchain?","a":"Smart contract vulnerabilities: Smart contracts are pieces of code deployed on the blockchain network to automate transactions. However, once the smart contract is deployed, its code cannot be changed, resulting in potential vulnerabilities that cannot  be fixed. Attackers can exploit these vulnerabilities to perform malicious actions, such as double-spend attacks, reentrancy attacks, etc."}]}],"pr":"c09681153b13af181968176cb5df1f905305f434f3eb701ce39eb166e20c28dd"}