{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How does blockchain record and manage transaction reward pool information?","a":"Previous block header hash value: To ensure that blocks are linked in sequence, each block header  contains the hash value of the previous block header."}]}],"pr":"ab2f45bf61993c828c9bb9f11323f343e3da33d59889d588f9b6098b768af805"}