Neat! Have not had a chance to play with it yet, but want to ask: is it provably fair and trustless? or only provably fair?

Provably fair allows players to detect if the house cheats, but they generally would need to pursue other enforcement avenues (such as a court system) to do anything about it.

Trustless, on the other hand, has an in-protocol mechanism to enforce the provable fairness.

Either way, it is great to see more innovations like this happening on lightning!