How to validate AppImage signature? #1234

I have managed to sign an AppImage by following the instructions here:

https://docs.appimage.org/packaging-guide/optional/signatures.html

This page describes how to validate the signature using a tool called "validate". However, no link to this tool is provided and there appears to be no further information to be found on the Internet anywhere?

How does one validate the signature of an AppImage?

As a developer, how do I provide the information to users to confirm validity of AppImages I supply? Do I put a digest on my website or something?