def __init__(self):
    self.idChain = 1
    self.previous = 0
    self.blocks_list = []
    self.firstHash = ''
    self.checkerChain = True
def __init__(self):
    self.idChain = 1
    self.previous = 0
    self.blocks_list = []
    self.firstHash = 
    self.checkerChain = True