def __init__(self, model, config):
super(VerifiedTxDb, self).__init__(model, config)
self.bs = self.model.get_blockchain_state()
self.vbs = VerifiedBlockchainState(
self.bs, self, config.get('testnet', False),
os.path.dirname(self.model.store_conn.path))
self.vbs.start()
self.lock = threading.Lock()
self.verified_tx = {}
