{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How does blockchain technology achieve joint authentication?","a":"Identity data storage: The user's identity data (such as name, address, contact information, etc.) is stored on the distributed ledger of the blockchain to ensure the security  and immutability of the data."}]}],"pr":"2f78f7dbaaf249740ee2137a4e57c80393ea7379f5bba469fd0372ff32a028a5"}