{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What is the role of key pairs in a blockchain?","a":"Authentication: Public key certificates are used for identity verification in blockchain systems. These  certificates are issued by trusted third parties, such as certificate authorities (CAs), and are bound to the user's public key. When a user wants to perform any operation in the blockchain, they must provide a valid public key certificate to prove their identity."}]}],"pr":"2af8ba70d83ce2217401b308a10c7046a7d6797ce5df5ffe9abde9347004225e"}