@pfefferle @linos @darnell I'm more worried about the query parameter in an IRI than I am about the Move activity having its target on the same domain! I'm no JSON-LD wizard but I wonder if that's valid as a URI to stick in an `actor.id`, and even if it's valid, I'd worry other implementations botching it or dropping the `?...` somehow, because of some unwitting behavior of underlying HTTP validation libraries or whatever