# Function: isContactPublicKey()

```ts
function isContactPublicKey(value): value is string;
```

Defined in: [packages/core/src/identity/contact-key.ts:121](https://github.com/leifriksheim/minca/blob/main/core/src/identity/contact-key.ts#L121)

Whether a string is a contact key's public half: a point on P-256

## Parameters

| Parameter | Type |
| ------ | ------ |
| `value` | `unknown` |

## Returns

`value is string`