{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the main cryptographic techniques used in blockchain?","a":"The main cryptographic technologies used in blockchain include hash algorithms, symmetric encryption algorithms, and asymmetric encryption algorithms. Among them, hash algorithms are mainly used for building blocks and confirming the integrity of transactions; symmetric encryption algorithms are used to protect the security of data transmission in blockchain; and asymmetric encryption algorithms are used to implement encryption and decryption functions to ensure the security  and privacy of data. In addition, blockchain technology also utilizes cryptographic principles to achieve digital signatures, authentication, and access control functions."}]}],"pr":"d33d5eac034b74f7c93df4168dcda7a0e883e79e8d02dd07bac8618498baf4b1"}