{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How to update program messages on the blockchain?","a":"Write a smart contract: Write a smart contract according to  your requirements, which includes the function of updating messages. In the contract,"}]}],"pr":"bb8db473221932a24286a6bf820616e620f4910dbbb43984cc454fa1429d0dec"}