[a_d]

Solution to the Byzantine General’s Problem using proof of work is possibly an example. The basic problem is: how do you make sure that multiple entities, which are separated by distance, are in absolute full agreement before an action is taken?

If one is not trying to solve it in the fastest time, then an agreed ‘truth’ can be reached after ‘some time’ without a central entity. By deciding to go ‘slow’, a solution can be found eventually.