{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How to securely handle transaction expiry issues in blockchain?","a":"Smart contracts: Utilize smart contracts to manage and execute transactions in a  decentralized manner, ensuring security and transparency."}]}],"pr":"c39c44b31b71831bc800c2e2e2ad1b09926bee424cd4ef6f5d8f2730b33a14d7"}