{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How does blockchain technology achieve user authentication?","a":"Public Key and Private Key: Each user has a pair of public and private keys. The public key is used to verify the user's identity, while the private key is used for  signing. When a user needs to verify their identity, they simply sign with their private key, and verification personnel use the user's public key to verify the signature, achieving the purpose of identity authentication."}]}],"pr":"408cdb3dc6bd669191534f47fb72a583f76a45ccdee4ed9f56d93f149f92a7d4"}