# BlockEvent
BlockEvent represents the addition or removal of a BlockIdentifier from storage. Streaming BlockEvents allows lightweight clients to update their own state without needing to implement their own syncing logic.
## Example Usage
```typescript
import { BlockEvent } from "icpmcp-rosetta-api";
let value: BlockEvent = {
sequence: 5,
blockIdentifier: {
index: 1123941,
hash: "0x1f2cc6c5027d2f201a5453ad1119574d2aed23a392654742ac3c78783c071f85",
},
type: "block_added",
};
```
## Fields
| Field | Type | Required | Description | Example |
| -------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------- |
| `sequence` | *number* | :heavy_check_mark: | sequence is the unique identifier of a BlockEvent within the context of a NetworkIdentifier. | 5 |
| `blockIdentifier` | [models.BlockIdentifier](../models/blockidentifier.md) | :heavy_check_mark: | The block_identifier uniquely identifies a block in a particular network. | |
| `type` | [models.BlockEventType](../models/blockeventtype.md) | :heavy_check_mark: | BlockEventType determines if a BlockEvent represents the addition or removal of a block. | |
