code: def rpc_get_blockstack_ops_at(self, block_id, offset, count, **con_info):
          
          if not check_block(block_id):
              return {'error': 'Invalid block height', 'http_status': 400}
  
          if not check_offset(offset):
              return {'error': 'Invalid offset', 'http_status': 400}
  
          if not check_count(count, 10):
              return {'error': 'Invalid count', 'http_status': 400}
  
          db = get_db_state(self.working_dir)
          nameops = db.get_all_blockstack_ops_at(block_id, offset=offset, count=count)
          db.close()
  
          log.debug("{} name operations at block {}, offset {}, count {}".format(len(nameops), block_id, offset, count))
          ret = []
          
          for nameop in nameops:
              assert 'opcode' in nameop, 'BUG: missing opcode in {}'.format(json.dumps(nameop, sort_keys=True))
              canonical_op = self.sanitize_rec(nameop)
              ret.append(canonical_op)
          
          return self.success_response({'nameops': ret})
docs: Get the name operations that occured in the given block.
          Does not include account operations.
  
          Returns {'nameops': [...]} on success.
          Returns {'error': ...} on error