{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How do blockchain API nodes ensure the security of data?","a":"Digital signatures: API  nodes can adopt digital signature technology to sign request data, ensuring that the data is not tampered with during transmission."}]}],"pr":"b8dc192e67aef3403f558c5a0d000ea0abb91777ef27a270f1986b3a5b27b1c9"}