{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What is the role of public keys in blockchain?","a":"Authentication: Public key certificates can be used for authentication. By  presenting a certificate, a user can prove their identity to another user or system."}]}],"pr":"a60fbc3cf238cd95b2bce2751587d6fbb6bfba52856467047e5d22d9810aef9b"}