[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [Crypto](https://evolu.dev/docs/api-reference/common/Crypto) › Entropy64

```ts
type Entropy64 = Uint8Array<ArrayBufferLike> &
  import("/vercel/path0/packages/common/src/Brand").Brand<"Entropy"> &
  import("/vercel/path0/packages/common/src/Brand").Brand<"Length64">;
```

Defined in: [packages/common/src/Crypto.ts:80](https://github.com/evoluhq/evolu/blob/e7144e2bbe9069362b62dec1b64a8aa922b8f1b0/packages/common/src/Crypto.ts#L80)