[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) › deriveSlip21Node

```ts
function deriveSlip21Node(
  label: string,
  parentNode: Uint8Array<ArrayBufferLike> &
    Brand<"Entropy"> &
    Brand<"Length64">,
): Uint8Array<ArrayBufferLike> & Brand<"Entropy"> & Brand<"Length64">;
```

Defined in: [packages/common/src/Crypto.ts:124](https://github.com/evoluhq/evolu/blob/e7144e2bbe9069362b62dec1b64a8aa922b8f1b0/packages/common/src/Crypto.ts#L124)

Derives a single node in the SLIP-21 hierarchical key derivation.

## See

[createSlip21](https://evolu.dev/docs/api-reference/common/Crypto/functions/createSlip21)