What do you mean prioritizes one url? Isn’t the data stored in the fragment so you can add metadata to any url in the content ?
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NIP 54 does example1.com#blurhash=whatever. I assume you could do `alt` hash values for alternative urls, but nothing in the PR mentions that. I basically want content-addressing for images like we have for events, rather than the hacky hash fragment approach. NIP 94 gets you this, but it's a pretty bulky payload to pass around if you want to avoid dereferencing an event id (and possibly failing).