This makes sense. However, this also means as one party of the off-chain transaction, I need to constantly monitor the main chain to make sure the other party d

This makes sense. However, this also means as one party of the off-chain transaction, I need to constantly monitor the main chain to make sure the other party doesn't try to screw me up. And if they do I need to publish the contract before they spend the money. Is this correct? And how can this be made 100% bulletproof?