{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What purposes can public keys in a blockchain be used for?","a":"Consensus mechanism: Public keys  play a significant role in the consensus mechanism of blockchain. For example,"}]}],"pr":"3c901a4e1f223032e14b0df180dd8360fdad9b1bd30b75e108751e9619ae600a"}