code: func (r FutureGetUnconfirmedBalanceResult) Receive() (btcutil.Amount, error) {
  	res, err := receiveFuture(r)
  	if err != nil {
  		return 0, err
  	}
  
  	// Unmarshal result as a floating point number.
  	var balance float64
  	err = json.Unmarshal(res, &balance)
  	if err != nil {
  		return 0, err
  	}
  
  	amount, err := btcutil.NewAmount(balance)
  	if err != nil {
  		return 0, err
  	}
  
  	return amount, nil
  }
docs: // Receive waits for the response promised by the future and returns returns the
  // unconfirmed balance from the server for the specified account.