In celestial's cases much simpler, because it's not a two way bridge. You don't have like, a client of both chains,. A running like celestias, agnostic to all these roll ups. Ssence does not know what the data means that the roll ups give it. But the the roll up itself runs a client of the celestial main chain. So there's an agent running a client on both sides, basically keeping track of it. There's not more going on between that and e celesta.