code: def get_purchased_assets_by_address(self, address, from_block=0, to_block='latest'):
          
          block_filter = EventFilter(
              ConditionBase.FULFILLED_EVENT,
              getattr(self.events, ConditionBase.FULFILLED_EVENT),
              from_block=from_block,
              to_block=to_block,
              argument_filters={'_grantee': address}
          )
          log_items = block_filter.get_all_entries(max_tries=5)
          did_list = []
          for log_i in log_items:
              did_list.append(id_to_did(log_i.args['_documentId']))
  
          return did_list
docs: Get the list of the assets dids consumed for an address.
  
          :param address: is the address of the granted user, hex-str
          :param from_block: block to start to listen
          :param to_block: block to stop to listen
          :return: list of dids