> For the complete documentation index, see [llms.txt](https://docs.tokenbot.com/home/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tokenbot.com/home/api-docs/webhooks/security.md).

# Security

## Signature Verification

Every webhook delivery is signed so you can verify it came from TokenBot. Each request includes these headers:

| Header                   | Description                                 |
| ------------------------ | ------------------------------------------- |
| `X-TokenBot-Signature`   | `sha256=<hex_digest>` HMAC of the payload   |
| `X-TokenBot-Timestamp`   | Unix seconds when the signature was created |
| `X-TokenBot-Event`       | The event type (e.g. `trade.executed`)      |
| `X-TokenBot-Delivery-Id` | Unique delivery ID (use for idempotency)    |

### How It Works

1. TokenBot builds the string `${timestamp}.${raw_body}`.
2. It computes `HMAC-SHA256(secret, that_string)` and sends it as `X-TokenBot-Signature: sha256=<hex>`, with the timestamp in `X-TokenBot-Timestamp`.
3. You recompute the same HMAC and compare in constant time.
4. Reject deliveries whose timestamp is older than your tolerance (TokenBot uses a 5-minute replay window).

### Node.js Example

```javascript
const crypto = require('crypto');

function verifyWebhook(rawBody, signature, timestamp, secret, toleranceSeconds = 300) {
  // Reject stale deliveries
  const now = Math.floor(Date.now() / 1000);
  if (Math.abs(now - Number(timestamp)) > toleranceSeconds) return false;

  const expected = 'sha256=' + crypto
    .createHmac('sha256', secret)
    .update(`${timestamp}.${rawBody}`, 'utf8')
    .digest('hex');

  return crypto.timingSafeEqual(Buffer.from(signature), Buffer.from(expected));
}

// Express middleware (note: raw body is required)
app.post('/webhooks', express.raw({ type: 'application/json' }), (req, res) => {
  const ok = verifyWebhook(
    req.body,
    req.headers['x-tokenbot-signature'],
    req.headers['x-tokenbot-timestamp'],
    process.env.WEBHOOK_SECRET
  );
  if (!ok) return res.status(401).send('Invalid signature');

  const event = JSON.parse(req.body);
  // Process event...
  res.status(200).send('OK');
});
```

### Python Example

```python
import hmac, hashlib, time

def verify_webhook(raw_body: bytes, signature: str, timestamp: str, secret: str, tolerance=300) -> bool:
    if abs(int(time.time()) - int(timestamp)) > tolerance:
        return False
    signed = f"{timestamp}.".encode() + raw_body
    expected = 'sha256=' + hmac.new(secret.encode(), signed, hashlib.sha256).hexdigest()
    return hmac.compare_digest(signature, expected)
```

## Secrets

Webhook signing secrets are prefixed `whsec_` and are shown **only once**, when the webhook is created. Rotate a secret with `POST /v1/webhooks/:id/rotate-secret` (the previous secret keeps working for a short grace window).

## Best Practices

* Always verify signatures **and** the timestamp before processing events.
* Use `crypto.timingSafeEqual` (Node.js) or `hmac.compare_digest` (Python) to prevent timing attacks.
* Deduplicate using `X-TokenBot-Delivery-Id` (or the payload's `event_id`).
* Respond with `2xx` quickly; process events asynchronously.


---

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