{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How to set the transaction validity period in blockchain?","a":"Transaction Confirmation: Transactions in the transaction pool need  to wait for a period of time for miners to pack them into new blocks. During this period, the transactions will be verified, confirmed, and added to the memory pool. Once the transaction is mined, it will be considered confirmed."}]}],"pr":"2ee534db481fa0f2f2782796658f773c2383fbf84d24c68279939129d43675ab"}