# finalizepsbt - Bitcoin

This method finalizes the inputs of a PSBT. If the transaction is fully signed, it will produce a network-serialized transaction that can be broadcast.

### Parameters

| Parameter | Type    | Required | Description                                                                                                  |
| --------- | ------- | -------- | ------------------------------------------------------------------------------------------------------------ |
| psbt      | string  | Yes      | A base64 string of a PSBT.                                                                                   |
| extract   | boolean | No       | If true and the transaction is complete, extract and return the complete transaction in hex (default: true). |

### Request

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

```bash
curl --location --request POST 'https://go.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "finalizepsbt",
    "params": ["cHNidP8BAHUCAAAAASaBcTce3/KF6Tig7cez...", true],
    "id": "getblock.io"
}'
```

{% endtab %}

{% tab title="Axios" %}

```javascript
import axios from 'axios';

const data = JSON.stringify({
    "jsonrpc": "2.0",
    "method": "finalizepsbt",
    "params": ["cHNidP8BAHUCAAAAASaBcTce3/KF6Tig7cez...", true],
    "id": "getblock.io"
});

const config = {
    method: 'post',
    url: 'https://go.getblock.io/<ACCESS-TOKEN>/',
    headers: {
        'Content-Type': 'application/json'
    },
    data: data
};

axios(config)
    .then(response => console.log(JSON.stringify(response.data)))
    .catch(error => console.log(error));
```

{% endtab %}

{% tab title="Request" %}

```python
import requests
import json

url = "https://go.getblock.io/<ACCESS-TOKEN>/"

payload = json.dumps({
    "jsonrpc": "2.0",
    "method": "finalizepsbt",
    "params": ["cHNidP8BAHUCAAAAASaBcTce3/KF6Tig7cez...", True],
    "id": "getblock.io"
})

headers = {
    'Content-Type': 'application/json'
}

response = requests.post(url, headers=headers, data=payload)
print(response.text)
```

{% endtab %}

{% tab title="Rust" %}

```rust
use reqwest::header;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = reqwest::Client::new();
    
    let response = client
        .post("https://go.getblock.io/<ACCESS-TOKEN>/")
        .header(header::CONTENT_TYPE, "application/json")
        .body(r#"{
            "jsonrpc": "2.0",
            "method": "finalizepsbt",
            "params": ["cHNidP8BAHUCAAAAASaBcTce3/KF6Tig7cez...", true],
            "id": "getblock.io"
        }"#)
        .send()
        .await?;
    
    println!("{}", response.text().await?);
    Ok(())
}
```

{% endtab %}
{% endtabs %}

### Response

```json
{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": {
        "psbt": "cHNidP8BAHUCAAAAASaBcTce3/KF6Tig7cez...",
        "hex": "0200000001074a0bfaf4462cef0a5665b89fd7fd5e4f8536630cde6824d09b20400b2f65ee000000006a47304402207...",
        "complete": true
    }
}
```

### Response Parameters

| Field    | Type    | Description                                                         |
| -------- | ------- | ------------------------------------------------------------------- |
| psbt     | string  | The finalized PSBT in base64 format (if not extracted).             |
| hex      | string  | The hex-encoded network transaction (if complete and extract=true). |
| complete | boolean | Whether the transaction has a complete set of signatures.           |

### Use Case

The `finalizepsbt` method is essential for:

* Completing signed PSBTs for broadcast
* Converting PSBTs to raw transactions
* Verifying PSBT signing completion
* Building transaction finalization workflows
* Preparing transactions for network submission
* Supporting hardware wallet signing flows

### Error Handling

| Status Code | Error Message    | Cause                            |
| ----------- | ---------------- | -------------------------------- |
| 403         | Forbidden        | Missing or invalid ACCESS-TOKEN. |
| -22         | TX decode failed | The PSBT string is malformed.    |

### Integration Notes

The `finalizepsbt` method helps developers:

* Complete multi-party signing workflows
* Prepare transactions for broadcast
* Validate signing completion
* Support hardware wallet integrations
* Build transaction submission pipelines


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.getblock.io/api-reference/bitcoin-btc/btc_finalizepsbt.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.