Blockchain is a new idea which has the potential to radically change the world of online (and non online) business. It is essentially a distributed database that contains records secured from tampering or revision. It is the basis of a number of bitcoin type currencies and solves problems of forged, reversed, or double credit transfers.
As the technology matures there seems to be a number of uses that it can me integrated with. If you follow this link you will see that students in Berlin have built a chess game that uses the technology. As I am in a 'post-first, read-later' mood at the moment I'm not exactly sure what they are doing here, although at a guess, it is about transmitting moves in a non forge-able way. At some point I will look at the source code to get a better idea of what is going on.