def get(self, key, tree_size):
   val, proof = VerifiableBase.get(self, str(key), tree_size)
   val = str(val) if len(val) else None
   return val, proof
 def get(self, key, tree_size):
     val, proof = VerifiableBase.get(self, str(key), tree_size)
     val = str(val) if len(val) else None
     return val, proof
 def __init__(self):
   VerifiableBase.__init__(self, VerifiableLog())
 def __init__(self):
     VerifiableBase.__init__(self, VerifiableLog())