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# SKStoreProductParameterAdNetworkAttributionSignature

The key that represents the advertising network’s cryptographic signature to use for install validation.

```
let SKStoreProductParameterAdNetworkAttributionSignature: String
```

## Discussion

The value for this key is an <doc://com.apple.documentation/documentation/Foundation/NSString>. The ad network creates the cryptographic signature, used to sign ads. For instructions on generating this value, see [Generating the signature to validate StoreKit-rendered ads](/documentation/StoreKit/generating-the-signature-to-validate-storekit-rendered-ads).

---

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