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@Edent Could you elaborate a little? Gravatar also works if you have 15 email addresses (source: me 😅).
And good point about proprietary extensions. One design goal might be to try to preemptively solve what they would try to extend in advance. (Not that that's easy.) I only suggested it as a thought experiment for exploring the problem space, for potential improvements to your own standard. 🤝
@Edent Big fan of the decentralization goal! Also curious about what can be learned from Gravatar (what to do, or what not to do). Since quite a few sites do use them, I wonder if having some compatibility with their "API" could be beneficial, to reduce implementation friction. (Edit: also curious about what drove their choice to use hashes)
I also wonder about how the standard would handle "wild success" - if Gmail or Yahoo wanted to implement it, how would that shift the requirements (including non-functional requirements like security)?
Great idea, good for you for tackling the general case!