[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) › Fingerprint

```ts
type Fingerprint = Uint8Array & Brand<"Fingerprint">;
```

Defined in: [packages/common/src/local-first/Storage.ts:209](https://github.com/evoluhq/evolu/blob/49ea8ca499566aba270f8cb601e7f49aa62320f8/packages/common/src/local-first/Storage.ts#L209)

A cryptographic hash used for efficiently comparing collections of
[TimestampBytes](https://evolu.dev/docs/api-reference/common/local-first/Timestamp/variables/TimestampBytes)es.

It consists of the first [fingerprintSize](https://evolu.dev/docs/api-reference/common/local-first/Storage/variables/fingerprintSize) bytes of the SHA-256 hash of
one or more timestamps.