code: def listBlockOrigin(self, origin_site_name="",  dataset="", block_name=""):
          
          try:
              return self.dbsBlock.listBlocksOrigin(origin_site_name, dataset, block_name)
          except dbsException as de:
              dbsExceptionHandler(de.eCode, de.message, self.logger.exception, de.serverError)
          except Exception as ex:
              sError = "DBSReaderModel/listBlocks. %s\n. Exception trace: \n %s" \
                      % (ex, traceback.format_exc())
              dbsExceptionHandler('dbsException-server-error', dbsExceptionCode['dbsException-server-error'],
                                  self.logger.exception, sError)
docs: API to list blocks first generated in origin_site_name.
  
          :param origin_site_name: Origin Site Name (Optional, No wildcards)
          :type origin_site_name: str
          :param dataset: dataset ( No wildcards, either dataset or block name needed)
          :type dataset: str
          :param block_name:
          :type block_name: str
          :returns: List of dictionaries containing the following keys (create_by, creation_date, open_for_writing, last_modified_by, dataset, block_name, file_count, origin_site_name, last_modification_date, block_size)
          :rtype: list of dicts