{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the specific reasons for refunding fees in blockchain transactions?","a":"Transaction rollback: In some cases, the blockchain network  may experience failures that prevent transactions from proceeding normally. To protect the integrity and security of the blockchain, the network may roll back to the previous block, in which case the transaction fees already paid may be refunded."}]}],"pr":"b691abbf7271ee65130d3a52190c36be8cda462b43ad9e4dff882ebbbf7dd0cd"}