---
title: SKAdNetwork 2.1 release notes
framework: storekit
role: article
role_heading: Article
path: storekit/skadnetwork-2-1-release-notes
---

# SKAdNetwork 2.1 release notes

A version of SKAdNetwork available in iOS 14 and later.

## Overview

Overview 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.

## See Also

### SKAdNetwork versions

- [SKAdNetwork 4 release notes](storekit/skadnetwork-4-release-notes.md)
- [SKAdNetwork 3 release notes](storekit/skadnetwork-3-release-notes.md)
- [SKAdNetwork 2.2 release notes](storekit/skadnetwork-2-2-release-notes.md)
- [SKAdNetwork 2 release notes](storekit/skadnetwork-2-release-notes.md)
- [SKAdNetwork 1 release notes](storekit/skadnetwork-1-release-notes.md)