Check correctness of a web client against multiple independent sources

Thank you for the feedback! I tried improving the last paragraph again to reflect what I mean. What I would like to have is something like "one server distributes the application, but others can confirm that the application was correctly installed" (meaning its hash is the agreed-upon hash).

Please review my edits after the approval. The major change is the last paragraph, as it looked not comprehensible. But please make sure I understood your logic correctly. If something is wrong, you can further fix it.

Thank you for the note. I think this part of your post is clear enough now.