[blackrock]

It’s possible that you can wait for the time traveler to arrive from the future with his time machine.

Then you can eliminate him, and take his time machine, and reverse engineer it to figure out how it works. Then you can travel further into the past, to meet your younger self, and give your younger self the theory and the blueprints to build such a time machine. Then, your younger self can patent it, and claim all legal intellectual property rights to it for the next 100 years.

And you can also tell your younger self to buy certain stocks in specific companies, that will enable your younger self with the financial capital to build such a time machine.

Thus, in the end, who invented the time machine? You did.