{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the roles of public keys and private keys in blockchain?","a":"Encryption and Decryption: Public  keys and private keys can be used to encrypt and decrypt data. Data encrypted with the public key can only be decrypted with the corresponding private key, and data encrypted with the private key can only be decrypted with the corresponding public key."}]}],"pr":"c9a9847d18a1f40e0d7bb4605e66746aeac83c859d69bdd87eabf0e996dda41e"}