{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How does blockchain address privacy protection issues?","a":"Ring Signature: Ring signature is a simplified class of group signatures named after the fact that signatures are composed of a certain rule in a  ring. In the ring signature scheme,"}]}],"pr":"d6ae6b7060a2e5aa8ba05d3935e599e0720a2b0b9c87f3229e7cdc314d704339"}