Put exactly the following string
"DBA36B5181D0C816F630E889D980A17457F6FB06"
into exactly the following search engine:
The quotes help to make google search for that and really only that.
Also if you’re unsure, you can for any gpg keys always contact upstream. Mostly I do this by creating a bug ticket. Would be easy for signal since they use github.
Support: Professional Support
I.e. this was created for a customer a while ago. Other than that, I am not interested much in signal in context of Whonix since it requires phone numbers for registration. Maybe this can be marked better and/or removed from Documentation index but I wouldn’t want to spend more time on it than necessary.
Same goes for:
(which is nonfreedom software)