cash has been variously shells, giant stones, glass beads, shiny metal, complicated paper, etc...
fundamental to the hand-to-hand nature of this Kong nonsense, is the feasibility to be transferred offline.
whatever Kong is, it's primary function will be a way to rip people off.
and taywrobel: as a side note, i realize my statement may appear unbelievably ironic to you. just know that's your problem and not mine.