docs: def btc_is_singlesig_segwit(privkey_info):
      """
      Is the given key bundle a p2sh-p2wpkh key bundle?
      """
      try:
          jsonschema.validate(privkey_info, PRIVKEY_MULTISIG_SCHEMA)
          if len(privkey_info['private_keys']) > 1:
              return False
  
          return privkey_info.get('segwit', False)
      except ValidationError:
          return False