Iran is moving from military muscle to legal mandates. The Iranian parliament is advancing a "Strait of Hormuz Management Plan" that would give Tehran permanent authority to tax global shipping—in Rials only. By demanding the local currency for transit and banning "hostile" vessels, Iran is attempting to break the back of U.S. sanctions and cement its role as the gatekeeper of 20% of the world's energy. Even as a fragile ceasefire holds, the rules of the sea are being rewritten.