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An APK can be signed by both v1 and v2 signatures at the same time, so it remains backwards compatible with previous Android releases.

The signature is computed and verified over the binary contents of the whole APK file, as opposed to decompressed file contents of each file in the archive in v1.

The cryptographic signature of the APK that is used to verify its integrity is now located immediately before the ZIP Central Directory.

You can read all about the low-level technical details of v2 signatures in the documentation, but here's a quick tl dr summary of the info you need as an Android app developer: With the introduction of the new APK Signature Scheme v2 in Android 7.0 Nougat, we decided to rewrite how assembling APKs works in the Android Gradle plugin.