{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the differences between private blockchains and public blockchains?","a":"Consensus mechanism: Due to the openness of public chains, a consensus mechanism is needed to elect  block creators."}]}],"pr":"8b4764a7cd367b2685f2b47c21586c063cf9af05a5879ec2b64e5f752b7e661a"}