{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How to prevent and repair smart contract vulnerabilities in blockchain?","a":"Input validation: Strictly validate the inputs of smart contracts to ensure the security  and correctness of the contract's operations."}]}],"pr":"c3ff546f6cd6dc6cc4d1aec7a948eb57cc770cf214b767c215a65ae573ec4c95"}