# ScanShieldedTrc20NotesByOvk

Scan outgoing notes (spent) (Confirmed state).

This method will use `30` [Compute Units](/v1/about/billing.md).

***

## **Parameters**

* `start_block_index` - Int32 - <mark style="color:red;">Required</mark> - An integer representing the starting block index for the shielded TRC20 contract events
* `end_block_index` - Int32 - <mark style="color:red;">Required</mark> - An integer representing the ending block index for the shielded TRC20 contract events
* `shielded_TRC20_contract_address` - String - <mark style="color:red;">Required</mark> - The address of the shielded TRC20 contract
* `ovk` - String - <mark style="color:red;">Required</mark> - A string representing the optional viewing key (ovk) for the shielded TRC20 contract
* `visible` - boolean - <mark style="color:red;">Required</mark> - A boolean value indicating whether the events should be visible or not

## **Returns**

`is_spent` - indicates whether the specified shielded TRC20 contract note has been spent or not

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

```bash
curl https://mainnet.tron.validationcloud.io/v1/<YOUR_API_KEY_HERE>/walletsolidity/scanshieldedtrc20notesbyovk \
    -X POST \
    -H "Content-Type: application/json" \
    -d '{
      "start_block_index": 434,
      "end_block_index": 567,
      "shielded_TRC20_contract_address": "CONTRACT_ADDRESS",
      "ovk": "OPTICAL_VIEWING_KEY",
      "visible": true
    }
'
```

{% endtab %}
{% endtabs %}


---

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