Imagine you're building the software that powers a jackpot machine in a bustling casino. This isn't just about random numbers; it's about creating a reliable, exciting, and fair experience for players, while also being easily maintainable and adaptable to different game types and casino regulations. The core challenge lies in designing a system that manages the game's state, handles different payout schemes, incorporates various bonus features, and ensures fairness through verifiable randomness, all while handling concurrent player interactions gracefully.

This problem requires you to design a system that simulates a jackpot machine. It involves modeling the machine's components, defining the rules of the game, and implementing the logic for handling spins, payouts, and bonus events. A key aspect is making sure the machine behaves predictably and fairly, and can be easily extended with new features or game variations. You'll need to consider how to manage concurrency so that multiple players can use the machine simultaneously without causing conflicts or inconsistencies. Also, the design should be robust and resilient to potential errors or unexpected events. It needs to be maintainable, extensible, and testable.

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