demurrage can coordinate multihop payment
2 phases
start from buyer with "finish on timeout" with continuous chunks, forces buyer to cancel if not everyone accepts
then seller signals buyer directly
then buyer finalizes, and the demurrage starts. it forces each hop to forward.
same demurrage then also provides guaranteed basic income
simpler than my 3 phase and with basic income by demurrage built in
buyer suggests demurrage rate and paths that accept it can be found, people have "trust index" with their demurrage rate, accept above 50% and below 150% this rate