{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"The block header in a blockchain contains what information?","a":"The block header in a blockchain contains the following information: 1. The hash value of the previous block header, used to ensure that blocks are connected in sequence; 2. The timestamp, recording the generation time of the block; 3. The random number, which is the answer to the arithmetic problem participated by all miners across the network; 4. The difficulty target, the difficulty score of the arithmetic problem; 5. Block height (block sequence number); 6. Transaction details, which record the sender, receiver, amount, and digital signature of the sender for each transaction; 7. Transaction counter, representing the  number of transactions in the block."}]}],"pr":"f6158f48cfdc2533f7f0604edd5583303af82d07ecbd13954bdfadca6bf32185"}