[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [local‑first/Storage](https://evolu.dev/docs/api-reference/common/local-first/Storage) › CrdtMessage

Defined in: [packages/common/src/local-first/Storage.ts:249](https://github.com/evoluhq/evolu/blob/e7144e2bbe9069362b62dec1b64a8aa922b8f1b0/packages/common/src/local-first/Storage.ts#L249)

A CRDT message combining a unique [Timestamp](https://evolu.dev/docs/api-reference/common/local-first/Timestamp/variables/Timestamp) with a [DbChange](https://evolu.dev/docs/api-reference/common/local-first/Storage/variables/DbChange).

Used in Evolu's sync protocol to replicate data changes across devices. Evolu
operates as a durable queue, providing exactly-once delivery guarantees for
reliable synchronization across application restarts and network failures.

## Properties

<a id="change"></a>

### change

```ts
readonly change: DbChange;
```

Defined in: [packages/common/src/local-first/Storage.ts:251](https://github.com/evoluhq/evolu/blob/e7144e2bbe9069362b62dec1b64a8aa922b8f1b0/packages/common/src/local-first/Storage.ts#L251)

---

<a id="timestamp"></a>

### timestamp

```ts
readonly timestamp: Timestamp;
```

Defined in: [packages/common/src/local-first/Storage.ts:250](https://github.com/evoluhq/evolu/blob/e7144e2bbe9069362b62dec1b64a8aa922b8f1b0/packages/common/src/local-first/Storage.ts#L250)