code: def commit(self):
          
  
          self.abort_if_abci_chain_is_not_synced()
  
          data = self.block_txn_hash.encode('utf-8')
  
          # register a new block only when new transactions are received
          if self.block_txn_ids:
              self.bigchaindb.store_bulk_transactions(self.block_transactions)
  
          block = Block(app_hash=self.block_txn_hash,
                        height=self.new_height,
                        transactions=self.block_txn_ids)
          # NOTE: storing the block should be the last operation during commit
          # this effects crash recovery. Refer BEP#8 for details
          self.bigchaindb.store_block(block._asdict())
  
          logger.debug('Commit-ing new block with hash: apphash=%s ,'
                       'height=%s, txn ids=%s', data, self.new_height,
                       self.block_txn_ids)
  
          if self.events_queue:
              event = Event(EventTypes.BLOCK_VALID, {
                  'height': self.new_height,
                  'transactions': self.block_transactions
              })
              self.events_queue.put(event)
  
          return ResponseCommit(data=data)
docs: Store the new height and along with block hash.