Problem: Unclear how to do A+(B or C) escrow with Lightning

[weex]

One possible solution to #143 is to add support for HTLCs and supporting Lightning protocols, however escrow in Rein depended upon multisig addresses to pay mediators of the form A+(B or C). I have read that it's possible to do more complicated escrows inside HTLCs but this hasn't been confirmed. Knowing whether this is possible or not is important before any work to integrate Lightning should begin.