code: def gpg_list_profile_keys( blockchain_id, proxy=None, wallet_keys=None, config_dir=None ):
      
  
      config_dir = get_config_dir( config_dir )
      client_config_path = os.path.join(config_dir, blockstack_client.CONFIG_FILENAME )
  
      if proxy is None:
          proxy = blockstack_client.get_default_proxy( config_path=client_config_path )
  
      accounts = blockstack_client.list_accounts( blockchain_id, proxy=proxy )
      if 'error' in accounts:
          return accounts
  
      accounts = accounts.pop('accounts')
  
      # extract
      ret = []
      for account in accounts:
          if account['service'] != 'pgp':
              continue 
  
          info = {
              "identifier": account['identifier'],
              "contentUrl": account['contentUrl']
          }
  
          if 'keyName' in account.keys():
              info['keyName'] = account['keyName']
  
          ret.append(info)
  
      return ret
docs: List all GPG keys in a user profile:
      Return a list of {'identifier': key ID, 'contentUrl': URL to the key data} on success
      Raise on error
      Return {'error': ...} on failure