@Edent I really like this! Though I’m a huge fan of static sites (being able to serve them via IPFS for caching, sneakernets, and distributed access), so the query parameter part of your proposal would make it impossible to serve on my blog.
Though it’d break the WebFinger parallel, I’d rather have sites look for `/.well-known/avatar/<sha256(email)>` or similar (the hash to make it marginally harder to scrape indexable static sites for email addresses)