Although Google Docs documents seem to have a unique ID in the URL, I'm wondering if there is a way to get a hash (MD5, SHA1) of a document without downloading it again. Has anyone attempted something similar? Is there some API call I can make?
Hashify.me stores the entire content of a webpage in its url.
Type your text in the editor box (supports Markdown) and watch the url self-updating instantly in your adress bar.