Upon re-reading this I think I identified the gap in your mental model: There’s no such thing as “LN transaction chains.” Every LN transaction is literally a b

Upon re-reading this I think I identified the gap in your mental model: There’s no such thing as “LN transaction chains.” Every LN transaction is literally a bitcoin transaction. Usually these are not broadcast to peers for settlement on the base layer, but the latest transaction always can be broadcast, just like any other Bitcoin transaction. I don’t follow other L2s closely, so maybe this differs from Ethereum and its derivatives. But the Bitcoin Lightning Network is 100% Bitcoin.