> For the complete documentation index, see [llms.txt](https://docs.getblock.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.getblock.io/api-reference/the-open-network-ton/getmasterchainblocksignatures-ton.md).

# getmasterchainblocksignatures - TON

Example code for the getmasterchainblocksignatures JSON-RPC method. Сomplete guide on how to use getmasterchainblocksignatures JSON-RPC in GetBlock.io Web3 documentation.

This method returns the validator signatures for a specific masterchain block. Use it to verify validator participation in consensus.

## Parameters

| Parameter | Type    | Required | Description                       |
| --------- | ------- | -------- | --------------------------------- |
| seqno     | integer | Yes      | Masterchain block sequence number |

## Request Example

{% tabs %}
{% tab title="cURL" %}
**REST (GET):**

```bash
curl --location --request GET 'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/getMasterchainBlockSignatures?seqno=45792554' \
--header 'Content-Type: application/json'
```

**JSON-RPC (POST):**

```bash
curl --location --request POST 'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "getMasterchainBlockSignatures",
    "params": {
        "seqno": 45792554
    },
    "id": "getblock.io"
}'
```

{% endtab %}

{% tab title="JavaScript (Axios)" %}

```javascript
import axios from 'axios';

const data = JSON.stringify({
    "jsonrpc": "2.0",
    "method": "getMasterchainBlockSignatures",
    "params": {
        "seqno": 45792554
    },
    "id": "getblock.io"
});

const config = {
    method: 'post',
    url: 'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>',
    headers: {
        'Content-Type': 'application/json'
    },
    data: data
};

axios(config)
    .then(response => console.log(JSON.stringify(response.data, null, 2)))
    .catch(error => console.log(error));
```

{% endtab %}

{% tab title="Python (Requests)" %}

```python
import requests
import json

url = "https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>"

payload = json.dumps({
    "jsonrpc": "2.0",
    "method": "getMasterchainBlockSignatures",
    "params": {
        "seqno": 45792554
    },
    "id": "getblock.io"
})

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

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

{% endtab %}

{% tab title="Rust (Reqwest)" %}

```rust
use reqwest::Client;
use serde_json::json;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = Client::new();

    let payload = json!({
        "jsonrpc": "2.0",
        "method": "getMasterchainBlockSignatures",
        "params": {
                "seqno": 45792554
        },
        "id": "getblock.io"
});

    let response = client
        .post("https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>")
        .header("Content-Type", "application/json")
        .json(&payload)
        .send()
        .await?;

    let result: serde_json::Value = response.json().await?;
    println!("{:#?}", result);

    Ok(())
}
```

{% endtab %}
{% endtabs %}

## Response Example

{% code overflow="wrap" %}

```json
{
    "ok": true,
    "result": {
        "@type": "blocks.blockSignatures",
        "id": {
            "@type": "ton.blockIdExt",
            "workchain": -1,
            "shard": "-9223372036854775808",
            "seqno": 45792554
        },
        "signatures": [
            {
                "@type": "blocks.signature",
                "node_id_short": "abc\u2026",
                "signature": "def\u2026"
            }
        ]
    },
    "id": "getblock.io",
    "jsonrpc": "2.0"
}
```

{% endcode %}

## Response Parameters

| Field                                | Type   | Description                                |
| ------------------------------------ | ------ | ------------------------------------------ |
| result.id                            | object | Block ID for which signatures are returned |
| result.signatures                    | array  | Array of validator signatures              |
| result.signatures\[].node\_id\_short | string | Short node ID of the signing validator     |
| result.signatures\[].signature       | string | Validator signature (base64)               |

## Use Cases

* Auditing validator participation per block
* Light client and SPV-style verification
* Validator monitoring and analytics

## Error Handling

| Status Code | Error Message       | Cause                                       |
| ----------- | ------------------- | ------------------------------------------- |
| 403         | Forbidden           | Missing or invalid `<ACCESS-TOKEN>`         |
| 422         | Validation Error    | Request parameters are missing or malformed |
| 429         | Too Many Requests   | Rate limit exceeded for your plan           |
| 504         | Lite Server Timeout | Upstream TON liteserver timed out           |

## SDK Integration

{% tabs %}
{% tab title="@ton/ton (JavaScript)" %}

```javascript
import { TonClient } from '@ton/ton';

const client = new TonClient({
    endpoint: 'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>'
});

// The @ton/ton client wraps the same JSON-RPC methods.
// For low-level access, use client.callGetMethod or client.provider.
```

{% endtab %}

{% tab title="pytoniq (Python)" %}

```python
from pytoniq import LiteClient
# For HTTP API access, use ton-http-client or call the JSON-RPC
# endpoint directly with requests as shown in the Request Example.
```

{% endtab %}
{% endtabs %}