{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the privacy protection mechanisms in blockchain?","a":"Private Keys and Public Keys: In blockchain,  private keys and public keys are used to encrypt and decrypt data."}]}],"pr":"51268e80b7c072f5ffbd8b18208d95fa17e8f2ffa762ae126f0eb3721f153a78"}