Ok so I need a storage server integration for our product. Blossom is very simple spec focused on fighting link rot and decentralization, key to which is that uploaded files must not be modified, so my app wouldn't have to trust the server. Blossom invents it's own auth instead of nip98, needlessly. 

Wrt nip96, which I didn't consider, but looking at right now, it's much more verbose and covers a lot, and uses hash for addressing, but lacks one critical thing - I want to ask the server to keep the original and do no transformations. Adding this one option would make it a superset of blossom and I would be able to use it. Maybe there's such an option and I missed it in the nip96 spec?