Jon HenshawNormalize this
(Updated: I changed Twitter to X and User to Profile. I intentionally left out Bluesky because their approach to profile naming doesn't fit this paradigm and precedent.)
Aswath Rao@jon
An amendment I would add is the notion indicate whether this is is wenfingerable or not.
Alternatively, let the universal id be an HTTP URI. After all that is what ActivityPub standard calls for, as well.