{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How does the history block of blockchain ensure the security of data?","a":"Secure consensus mechanism: Blockchain employs a secure consensus mechanism, such as Proof of Work  (PoW) or Delegated Proof of Stake (DPoS), to ensure that transactions are valid and"}]}],"pr":"705a30b5fa0fbe9d94f0786ddb046e7a29a0fcb6a1eb2d367b97de0878d077a0"}