{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the principles of blockchain technology?","a":"Block：The blockchain is a chain of data structures composed of a series  of data blocks connected in chronological order. Each block contains a certain amount of data and is connected to the previous block by a hash value."}]}],"pr":"b607f3e3a40cbfe34ec312f2920d08231cc24437f757d7e7bcebbbef445fe89b"}