{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the challenges of blockchain in protecting personal privacy?","a":"User Identity Privacy: In some blockchain applications, there are still issues with protecting user identity privacy. For example, Bitcoin uses hashed  public keys as personal accounts, but during the transaction process, user identities may still be exposed."}]}],"pr":"eaa10bd04d5cc41fad816cd8eecefd5ab9c8966dfb9cd14ac62197e86b97a627"}