{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"The block header of a blockchain contains what information?","a":"The block header of a blockchain contains the following information: version number (version), previous block address (prev-block), timestamp (timestamp), nonce (random number), current target hash value (target hash), Merkle root (Merkle  root), block height (block height), transaction count (transaction count), total transaction amount (total transaction amount), and block size (block size). These pieces of information work together to ensure the integrity and security of the blockchain database."}]}],"pr":"338bb05e3bfe6501fef3650e448537af7eae0fd5143b10216d048221d696e452"}