Ebook mastering bitcoin third version, web page 179.
In MAST and with scriptless multisignatures, a mutual satisfaction clause is straightforward
to design. We merely make one of many high leaves of the script tree a scriptless multi
signature between all events. We already noticed a fancy contract between
a number of events with a easy mutual satisfaction clause in Determine 7-7. We might
make that extra optimized by switching from scripted multisignature to scriptless
multisignature.
What’s the mutual satisfaction clause in Determine 7-7? thanks.

