{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How do objects in a blockchain achieve persistence and immutability?","a":"Cryptographic encryption: The data in blockchain is encrypted using cryptographic techniques  to ensure its security. Each block contains a hash value pointing to the previous block, giving blockchain its immutable characteristic."}]}],"pr":"8c49b6fde09f06b75b607863fcb023b46be3dec52ac47490831f536632278c0b"}