code: func (c *Client) ExportWatchingWallet(account string) ([]byte, []byte, error) {
  	return c.ExportWatchingWalletAsync(account).Receive()
  }
docs: // ExportWatchingWallet returns the raw bytes for a watching-only version of
  // wallet.bin and tx.bin, respectively, for the specified account that can be
  // used by btcwallet to enable a wallet which does not have the private keys
  // necessary to spend funds.
  //
  // NOTE: This is a btcwallet extension.