# Fireblocks Webhooks

## When to Use This Skill

* How do I receive Fireblocks webhooks?
* How do I verify the `Fireblocks-Webhook-Signature` header?
* Why is my Fireblocks webhook signature verification failing?
* How do I handle `transaction.created` or `transaction.status.updated` events?
* How do I validate a Fireblocks detached JWS (RS512) against the JWKS endpoint?

## Verification (core)

Fireblocks Webhooks v2 signs every request with a detached JWS (RS512, RSA + SHA-512) in the `Fireblocks-Webhook-Signature` header. The header is a compact JWS with an empty payload segment (`<protected-header>..<signature>`). To verify, reinsert the raw request body (base64url-encoded) as the payload, then verify against the auto-rotated regional JWKS (`https://keys.fireblocks.io/.well-known/jwks.json`). Use the raw body bytes — never `JSON.parse` first.

```javascript
import { createRemoteJWKSet, compactVerify } from 'jose';

const JWKS = createRemoteJWKSet(
  new URL('https://keys.fireblocks.io/.well-known/jwks.json')
);

// signatureHeader = value of the `Fireblocks-Webhook-Signature` header (detached JWS)
export async function verifyFireblocksWebhook(rawBody, signatureHeader) {
  const [header, , signature] = signatureHeader.split('.');   // header .. signature
  const payload = Buffer.from(rawBody).toString('base64url');  // raw body as JWS payload
  const fullJws = `${header}.${payload}.${signature}`;
  const { payload: verified } = await compactVerify(fullJws, JWKS, {
    algorithms: ['RS512'],                                     // pin alg (no alg confusion)
  });
  return JSON.parse(Buffer.from(verified).toString('utf8'));   // { id, eventType, data, ... }
}

```

> For complete handlers with route wiring, event dispatch, and tests, see:
> 
> * [examples/express/](https://github.com/hookdeck/webhook-skills/tree/main/skills/fireblocks-webhooks/examples/express/)
> * [examples/nextjs/](https://github.com/hookdeck/webhook-skills/tree/main/skills/fireblocks-webhooks/examples/nextjs/)
> * [examples/fastapi/](https://github.com/hookdeck/webhook-skills/tree/main/skills/fireblocks-webhooks/examples/fastapi/)

> Legacy (Webhooks v1): the older `Fireblocks-Signature` header (base64 RSA PKCS#1 v1.5 over the SHA-512 hash of the raw body, verified against a static per-environment PEM key) reached its migration deadline on March 20, 2026. New integrations should use the v2 JWKS scheme above. See [references/verification.md](https://github.com/hookdeck/webhook-skills/blob/main/skills/fireblocks-webhooks/references/verification.md) for the legacy path.

## Common Event Types

Event names are dotted lowercase (v2). The event type is in the `eventType` field; the resource lives in `data`.

| Event | Description |
| --- | --- |
| `transaction.created` | A new transaction was created |
| `transaction.status.updated` | The transaction's primary status changed |
| `transaction.approval_status.updated` | The transaction's approval/authorization status changed |
| `transaction.network_records.processing_completed` | Network-level (on-chain) processing completed |
| `transaction.alert.stuck_confirming` | An EVM transaction is stuck `CONFIRMING` due to low fees |

Other categories (`vault_account.*`, `whitelist.*`, `tokenization.*`, `network_connection.*`) follow the same envelope. See [references/overview.md](https://github.com/hookdeck/webhook-skills/blob/main/skills/fireblocks-webhooks/references/overview.md) and the [transaction event types](https://developers.fireblocks.com/reference/webhooks-structures-eventtypes-transaction).

## Environment Variables

```bash
# Selects the regional JWKS endpoint: production | eu | eu2 | sandbox
FIREBLOCKS_WEBHOOK_ENV=production
# Optional: override the JWKS URL entirely (advanced / self-testing)
# FIREBLOCKS_JWKS_URL=https://keys.fireblocks.io/.well-known/jwks.json

```

No shared secret is needed — verification uses Fireblocks' public JWKS keys.

## Local Development

```bash
# Start tunnel (no account needed)
npx hookdeck-cli listen 3000 fireblocks --path /webhooks/fireblocks

```

## Reference Materials

* [references/overview.md](https://github.com/hookdeck/webhook-skills/blob/main/skills/fireblocks-webhooks/references/overview.md) - Fireblocks webhook concepts and event types
* [references/setup.md](https://github.com/hookdeck/webhook-skills/blob/main/skills/fireblocks-webhooks/references/setup.md) - Configure webhooks in the Fireblocks Console / Webhooks v2 API
* [references/verification.md](https://github.com/hookdeck/webhook-skills/blob/main/skills/fireblocks-webhooks/references/verification.md) - Detached JWS / JWKS verification details and gotchas