I will check the question that Teacher Jason mentioned, and there should be two possibilities. Robinhood and Arbitrarum have been collaborating since the ETHDenver event in 2024, and they have already established a foundation for cooperation. It should be almost a year since they started to explore each other. Although Optimism's OP Stack can be used, which is currently being used by BASE, and Hood and Coin are in a competitive relationship, it is normal to choose Arbitrarum's solution.