I imagine it only verifies the image based content, right? Not video
Amethyst v0.34.0: NIP-94 Support
All Amethyst uploads (videos, images, and GIFs, on the regular feed and on chats/DMs) will create a Kind 1063 event with a hash of the content of those files.
When you see the verification mark below, it means the app has verified that the current image matches the hash when posting. Image servers now cannot change the image without you noticing.

Downloads:
- Play Edition with Translations: https://github.com/vitorpamplona/amethyst/releases/download/v0.34.0/amethyst-googleplay-universal-v0.34.0.apk
- F-Droid Edition without Translations: https://github.com/vitorpamplona/amethyst/releases/download/v0.34.0/amethyst-fdroid-universal-v0.34.0.apk
Discussion
The mark is only for images for now. But hopefully we find a way to do video as well (buffering is an issue)