{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How is permission control ensured in a blockchain?","a":"Cryptographic technology: Blockchain uses encryption algorithms (such as  SHA-256) to encrypt data, ensuring the security of the data. Meanwhile, through the asymmetric encryption technology of private keys and public keys, privilege control over data access is realized. Only users who possess private keys can decrypt the corresponding public key data, thereby ensuring the security of data transmission."}]}],"pr":"3f60d1d1e2b8a04abfd90539772490aa818816b9b06c134e2fa66ec3f7121167"}