@smj FYI I made a feature request to them but am unsure at this time what backend verification is required.
@smj found it. Looks like you have to make it happen. https://keybase.io/blog/keybase-proofs-for-mastodon-and-everyone
"I appreciate SDF but it's a general-purpose server and the name doesn't make it obvious that it's about art." - Eugen Rochko