>This approach has historically been thought of as insecure (the nothing at stake problem and the long-range attack have been two of the major unsolved vulnerab

>This approach has historically been thought of as insecure (the nothing at stake problem and the long-range attack have been two of the major unsolved vulnerabilities), but Vitalik and team have been diligently working on solutions to these problems. Ethereum now runs on proof-of-work, but the expectation is to switch to proof-of-stake in the next 12–18 months. Well with all the other stuff on his plate solving a very difficult problem in the next 12-18 months will be easy and luckily there's no actual time limit aside from the same one he baked into etherium.