# Transaction refusal

If the user doesn't approve the transaction request, the **PKSA** can inform the **HAS** with the following message:

### sign\_nack

```javascript
{
    cmd: "sign_nack",
    uuid: string,
    data: string,
    pok: string
}
```

{% tabs %}
{% tab title="Properties" %}

* **`uuid`**: the request identifier
* **`data`**: the `uuid` encrypted with `auth_key` and converted to Base64
* **`pok`**: the `uuid` encrypted using the account private key and the HAS server public key (see [Proof of Key](/has-for-wallets-pksa/proof-of-key.md))
  {% endtab %}
  {% endtabs %}


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