{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How to securely handle transaction expiry issues in blockchain?","a":"Synchronize transaction expiration time: All  participants must synchronize the transaction expiration time within the blockchain network to ensure the timeliness of transactions. This can be achieved through integrated timestamp services and smart contracts."}]}],"pr":"f2715a1e3020831d37ed0e2ef2cbb8a516dfd4114d097d698daa9fbf28e12399"}