# Function: keyProof()

```ts
function keyProof(key, terms?): Promise<string>;
```

Defined in: [packages/core/src/session/connect.ts:305](https://github.com/leifriksheim/minca/blob/main/core/src/session/connect.ts#L305)

A key's proof that it holds itself, for a connect request with these terms (`ConnectRequest.proof`)

## Parameters

| Parameter | Type |
| ------ | ------ |
| `key` | \{ `did`: `string`; `keys`: `CryptoKeyPair`; \} |
| `key.did` | `string` |
| `key.keys` | `CryptoKeyPair` |
| `terms?` | [`KeyTerms`](https://minca.dev/api/session/type-aliases/KeyTerms.md) |

## Returns

`Promise`\<`string`\>