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# SKAdNetwork 2.1 release notes

A version of SKAdNetwork available in iOS 14 and later.

## Discussion

Use `“2.1”` as the version number when signing ads for this version.

Ad networks are eligible to receive a version 2.1 postback if all three of the following conditions are met:

- The source app generates a signature for version 2.1.
- The source app is built with the iOS 14 SDK or later.
- The advertised app is App Store-signed and running on a device with iOS 14 or later.

### New features

New features include:

- SKAdNetwork now signs install-validation postbacks using Apple’s NIST P-256 public key. For more information, see [Verifying an install-validation postback](/documentation/StoreKit/verifying-an-install-validation-postback).

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