code: def to_json(self):
          
          ret = {
              'address': self.address,
              'domain': self.domain,
              'block_number': self.block_height,
              'sequence': self.n,
              'txid': self.txid,
              'value_hash': get_zonefile_data_hash(self.zonefile_str),
              'zonefile': base64.b64encode(self.zonefile_str),
              'name': self.get_fqn(),
          }
          
          if self.pending is not None:
              ret['pending'] = self.pending
  
          if self.resolver is not None:
              ret['resolver'] = self.resolver
  
          return ret
docs: Serialize to JSON, which can be returned e.g. via RPC