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 An amend to NIP-96 could add a query string like `?ref=x` when downloading to only respond succesfully if server has a file with `x` value equal to the hash used to request the file.

For uploads, NIP-96 already has "no_transform" field, which would make  `ox` equal to `x`. 
 Yes, that would be a step closer. But that feels like a lot of band-aids to get what blossom has out of the box, and by design. no_transform would also still only be opt-in, and the spec says servers can reject those requests. NIP 96 gives servers too much latitude to have a strong guarantee of referential transparency.