{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How does blockchain improve the efficiency of data trading?","a":"Security: Blockchain utilizes cryptography to guarantee the security of data transmission and access, preventing data  tampering and forgery."}]}],"pr":"a124bdca059aa22b78ca6471ad73289b4b0336f7302ed6b5f959e146884e4cf7"}