{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How to ensure the security of transactions in blockchain?","a":"Cryptographic protection: Using encryption algorithms and digital signature technology to ensure the security  and integrity of transaction data."}]}],"pr":"c1e91b8e55bbf99771cd60762563eeb2ebc69a980753ba00e0fda00193da3ee5"}