Oh and to prevent what happened last time (the post getting flagged as an overheated discussion), I'm going to close the laptop and come back to this in a few hours! So if you ask a question, I'm not ignoring you – I'll respond later.
This is neat.
>For example give a marketing agency authentication to claim the domain on social media but nowhere else.
How does it prevent them from claiming it elsewhere?
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Server is responding back with an 500 Internal Server Error.
HN hug of death maybe?
I like it.
My feedback would be a simpler approach, ditching the hash. Why not just encourage people to put their email address in plain text in a DNS record? If they want anonymity, they can fall back to the way verification is done today. If they want convenience, they can broadcast their email&DNS link.
For example, I own "BreckYunits.com" and my email address is listed throughout my site. I wouldn't be giving up any privacy by putting that in a DNS record.
Sure, some people will exaggerate the fear risk (usually the ones selling a security product), but I'm of the old school opinion that we should advocate good behavior and admonish bad behavior on the web and build a more civil world.