{"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":"3baa252eb0f4c1910c9c6a435f100f5120f831f0a15a0f142bea5b9db57de4a9"}