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# ValidationInterfaceCallbacks

Swift-friendly wrapper for validation interface callbacks.

```
final class ValidationInterfaceCallbacks
```

## Overview

Populate the closure properties you care about, then pass to
[`setValidationInterface(_:)`](/documentation/BitcoinKernel/ContextOptions/setValidationInterface(_:)). The kernel takes ownership
of the callback state and releases it when the context is destroyed.

All callbacks are dispatched on kernel-internal threads and **block
further validation** while executing — keep handlers fast.