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# Warning

Warnings surfaced by validation via
[`warningSet`](/documentation/BitcoinKernel/NotificationCallbacks/warningSet) and cleared via
[`warningUnset`](/documentation/BitcoinKernel/NotificationCallbacks/warningUnset).

```
enum Warning
```

## Overview

Warnings represent operationally significant conditions that don’t
block validation but should be surfaced to operators — typically
shown in a UI banner or emergency-logged.

Maps to `btck_Warning` constants in the kernel C API.