I was curious about a solution to this problem so i've been looking around. for those using chrome you can go to chrome://cache and then search for the url of your signature. if you click on the link it will show a hex/ascii preview of the contents. if you copy everything there and then paste it here
http://www.sensefulsolutions.com/2012/01/viewing-chrome-cache-easy-way.html it will convert it to like the normal content you'd see.
This will only work on a computer/browser that hasn't seen and cached the new missing signature you're showing. So if you have a computer where you haven't accessed d2jsp since it went down you should be able to dig it up
This post was edited by Aimed_Shot on Oct 27 2014 01:34pm