Did it. But now I (and you) have red exclamation points in our verifications on Amethyst. Any ideas why?
I now have a verified name linked to my domain name, so that I can now
be identified by henry@bblfish.net. As I understand this would help
in case I loose control of my keys somehow.
I followed the instructions here
https://nostr.how/en/guides/get-verified
It was actually quite easy, as I just need to add this file to
my web server
https://bblfish.net/.well-known/nostr.json
The result on #primal looks like this:
Discussion
I am on iOS so I don't have access to Amethyst. But my Access-Control-Allow-Origin header is set correctly I think. 
How do I set that? Permissions? Or is it something in the file?
The pubkeys should be in hex format, not npub. It looks like some clients are gracefully handling it, but you may experience issues with some clients.
https://github.com/nostr-protocol/nips/blob/master/05.md#example