[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) › OwnerSecret

```ts
const OwnerSecret: brand("OwnerSecret", Entropy32);
```

Defined in: [packages/common/src/local-first/Owner.ts:137](https://github.com/evoluhq/evolu/blob/e7144e2bbe9069362b62dec1b64a8aa922b8f1b0/packages/common/src/local-first/Owner.ts#L137)

32 bytes of cryptographic entropy used to derive [Owner](https://evolu.dev/docs/api-reference/common/local-first/Owner/interfaces/Owner) keys.

Can be created using [createOwnerSecret](https://evolu.dev/docs/api-reference/common/local-first/Owner/functions/createOwnerSecret) or converted from a
[Mnemonic](https://evolu.dev/docs/api-reference/common/Type/variables/Mnemonic) using [mnemonicToOwnerSecret](https://evolu.dev/docs/api-reference/common/local-first/Owner/functions/mnemonicToOwnerSecret).