---
title: signature
framework: foundationmodels
role: symbol
role_heading: Instance Property
path: foundationmodels/transcript/reasoning/signature
---

# signature

Opaque producer-supplied signature for this reasoning entry.

## Declaration

```swift
var signature: Data?
```

## Discussion

Discussion When this is non-nil, segments may represent a partial summary or be empty; full reasoning text may not be available.

## See Also

### Inspecting the reasoning

- [description](foundationmodels/transcript/reasoning/description.md)
- [metadata](foundationmodels/transcript/reasoning/metadata.md)
- [segments](foundationmodels/transcript/reasoning/segments.md)