{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How to obtain the latest block hash in a blockchain to ensure the validity of transactions and expiration time?","a":"Calculate the block hash: To get the latest block hash, you need to  use SHA-256 or other similar hashing algorithms."}]}],"pr":"5bcd6939a2052b01387d8d6e2aa4f8fec3e2cdf12f1c6e41a222dcb7e8214805"}