I used this site in the past but I want to be cautious. You do provide signed document with the version history including the hash. But I doubt anyone will go through that hassle.

The site would be much more usable if you provided browser extensions to verify the checksum. This is convenient and would require a hacker to break in your server AND whatever service you use to distribute the extension. Being it github, sourceforge, google chrome store, mozilla website or other.

Maybe a greasemonkey script, given it might be the simplest to develop. Or maybe even a bookmarklet. Now that I think about it, you could distribute the whole thing as a bookmarklet. Would be a huge bookmarklet, but it should work.

As it is, it's too much of a hassle to verify authenticity.