# How do I know if Sentinel3 is working for me?

The easiest way to know that Sentinel3 is working for you is to visit a trusted site you use regularly and attempt a transaction. For example, go to OpenSea to list one of your NFTs for sale or to Uniswap to swap some coins.

<figure><img src="/files/q3dEfT3Pr4Z7nhZWuXMz" alt=""><figcaption></figcaption></figure>

Sentinel3's loader will show up when you attempt a transaction or signature, letting you know it's checking if what you're about to do is safe.

If Sentinel3 doesn't show you an [**alert**](/kerberus/sentinel3/alert-types.md), you are safe to proceed and covered up to $30k.

{% hint style="warning" %}
If you don't see Sentinel3's loader when attempting a transaction or signature, it could be one of the following:

1\) You added the website to your allowed list. You can check this by clicking on the extension.

2\) The website is interacting with a testnet which Sentinel3 doesn't scan or protect on.

3\) The website is a blockchain explorer which Sentinel3 doesn't scan or protect on.

4\) Something is making it malfunction. [**Please reach out to us on Discord if this happens**](https://discord.gg/kerberus).
{% endhint %}


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