{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What purposes can public keys in a blockchain be used for?","a":"Digital signatures: Public keys can be used to generate digital signatures to verify the source and integrity of the data. Digital signatures can ensure that the data is not tampered with  during transmission, and can prove the source and sender of the data."}]}],"pr":"6df5b48d5170ea646d50e057614ad2ecbd4a5403372063d24568107620ef4b41"}