Non-determinism is possible if your system's inputs are entirely deterministic. If your system's inputs are deterministic and your initial state is deterministi

Non-determinism is possible if your system's inputs are entirely deterministic. If your system's inputs are deterministic and your initial state is deterministic, you don't even have to worry about state management or side effects (no need for functional programming). This is possible to achieve with certain fork-resistant blockchain systems. You can also achieve determinism across multiple blockchain systems with different consensus mechanisms so long as they are both fork-resistant.