A verified app is an app that is published on Flathub by its original developer or a third party approved by the developer. Flathub has verified the developer's identity using the app id and the developer's website or profile on a source code hosting site.
Detailed description of your suggestion
Hi there, I've been contacting flatpak projects to request validation in their package so that people would have more faith in the app and in flathub.
The flatpack was made by an contribuitor, and it is been presented as an official way to install the app
https://www.blockbench.net/downloads
Verification docs: https://docs.flathub.org/docs/for-app-authors/verification
Flatpak source code: https://github.com/flathub/net.blockbench.Blockbench
Flatpack: https://flathub.org/apps/net.blockbench.Blockbench