> ## Documentation Index
> Fetch the complete documentation index at: https://docs.crossmint.com/llms.txt
> Use this file to discover all available pages before exploring further.

# DelegatedSigner

> Kotlin Sealed Class

**Sealed Class**

```kotlin theme={null}
sealed class DelegatedSigner
```

## Properties

### expiresAt

```kotlin theme={null}
abstract val expiresAt: Long?
```

Optional expiration timestamp in milliseconds since Unix epoch. If set, the delegated signer will expire at this time.