{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What security issues are involved in blockchain?","a":"User Security: The decentralized nature of blockchain makes it difficult to verify the  identity of users, which may lead to the occurrence of scams and fraud."}]}],"pr":"30ce82a68e7354f444908fcb0fb9fe943dfd60f7171fbd70d789d3a119eecf26"}