Earlier quoted context omitted.
Obviously the solution is a DeadManSwitchCoin.
I proposed this in an earlier thread and got some push back on the utility of the concept https://news.ycombinator.com/item?id=6509824
I almost imagine doing something like this in a physical system is easier than at the cryptographic level, but that probably is to be expected considering my physics background. I mean, using quantum phenomena seems to be an obvious way to do it this albeit completely infeasible at this time.