Could you send me a link to something explaining more in depth what you are talking about here. Possibly a post if you have made one already. Sounds interesting and it created a possibility in my head and would like to read more to see if what I'm thinking of is actually possible to do.
Will all 301 perm-redirect back to the original source.
The original source has canonical url link in the header of the page.
Telling the browser, the user browsing it, and the search engines, that it is the original source, and that while a shortning url might be popular (imagine 500,000 times linked). It won't be counted as dupe content, as the source is 301 perm redirected to the canonical url.