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

```ts
const ownerWriteKeyLength: number &
  Brand<"NonNaN"> &
  Brand<"Finite"> &
  Brand<"Int"> &
  Brand<"NonNegative">;
```

Defined in: [packages/common/src/local-first/Owner.ts:105](https://github.com/evoluhq/evolu/blob/75385100f77e1eb8e9ccd51ed900cf77452d4c09/packages/common/src/local-first/Owner.ts#L105)