Indeed. In fact, most of the solutions I've seen mentioned lately are all of one trend that edges closer and closer towards:

"Build a completely unsafe and suspicious AI, put it on a disconnected small computer with a bunch of nanites for self-modification and a large power reserve, with so many walls and physical barriers that it is impossible for the AI to get through with the amount of energy it could generate if it turned half of its materials into antimatter, and then put no input or output channels there of any kind, just have a completely useless multi-trillion-dollar marvel of science and engineering sitting in the practical equivalent of a black hole."