It's old now but https://download.wpsoftware.net/bitcoin/wizardry/mw-slides/2018-05-18-l2/slides.pdf may help, it's high level and abstract, from the originator of the idea (Poelstra).

Important to note that while this all might seem a bit "pie in the sky", it's at the heart of a generally accepted plan to upgrade the Lightning network to a better privacy model, see "PTLC" - I feel sure you'll have heard of that.

The above experiment is an extension to a more-than-2 party swap, which happens to work with adaptors (whereas it couldn't work with HTLC style coinswaps, because hashes aren't additive). That's about it.