{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How do you ensure the expiry time of transactions in a blockchain?","a":"Smart Contracts: By writing smart contract code, you can set the expiration time for transactions. Smart contracts are automatically executed scripts running on the blockchain that can ensure transactions are  triggered at specified time points. When a transaction reaches its expiration time, the smart contract will automatically perform corresponding actions, such as releasing locked funds or transferring assets."}]}],"pr":"fded13ed947055d84aa460b0651e2fe4feb6c7fa5f6b7f1379314a8bff78477d"}