{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How to prevent vulnerabilities in smart contracts in blockchain?","a":"Fully understand and master the programming languages of smart contracts, such  as Solidity, Vyper, etc., and understand their characteristics, specifications, and best practices."}]}],"pr":"8e503c3cad37af1c38b4fb078e74867e42195f9d9ae27e6d307db8a17c73503a"}