> The nip doesnât seem to specify how to reference the image from a kind=1 note.
Yep, we just do what we usually do for every other referenced post, either the old #[] or the new nostr:nevent.
> Side note: the nip doesnât specify which tags are required/optional and whether any can be repeated.
Yep. We should probably refine the text as we figure out the details.
> Are 1063 events replaceable?
They are not replaceable.
> Is there a list of allowed protocols for the URL?
Amethyst assumes any URI. As a viewer, we must support whatever comes in.