{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How do you handle transaction expiration in a blockchain?","a":"Setting the validity period of transactions: The blockchain system can set the validity period of transactions, such as stipulating that transactions that are not confirmed within a certain period of time will automatically expire. In this way, expired transactions will be  automatically cleared by the system, thereby reducing the burden on the blockchain network."}]}],"pr":"83a76944ea4fd31eed4d319de49750683cf2edd992a0ef2d398b41fa8278c5ae"}