def set_null(self):
    self.nVersion = 1
    self.hashPrevBlock = 0
    self.hashMerkleRoot = 0
    self.nTime = 0
    self.nufos = 0
    self.nNonce = 0
    self.sha256 = None
    self.hash = None
def set_null(self):
    self.nVersion = 1
    self.hashPrevBlock = 0
    self.hashMerkleRoot = 0
    self.nTime = 0
    self.nufos = 0
    self.nNonce = 0
    self.sha256 = None
    self.hash = None