# Fault

Fires when a validator equivocates (signs two conflicting blocks in the same slot).

## Import

```ts
import { SseClient, EventName } from 'casper-js-sdk';
```

## Usage

```ts
sseClient.subscribe(EventName.FaultEventType, (raw) => {
  const result = raw.parseAsFaultEvent();
  if (result.err) return;

  const fault = result.val.fault;
  console.log('Equivocating validator:', fault.publicKey.toHex());
  console.log('Era ID:', fault.eraId);
  console.log('Timestamp:', fault.timestamp);
});
```

## Payload

### FaultPayload

| Field | Type | Description |
|---|---|---|
| `eraId` | `number` | Era in which the fault occurred |
| `timestamp` | `string` | Time of detection |
| `publicKey` | `PublicKey` | The equivocating validator's key |

## Notes

- Equivocating validators are slashed (lose part of their stake).
- This event is rare in practice on well-operated networks.