In a shakepearean tragedy it is traditional to have some restoration of justice after the catastrophe. how is justice restored at the end of Othello?

There isn't too much to salvage after a Shakespearean tragedy. Most of the main characters are dead. Still. Iago is still alive and there is some justice to be doled out. Lodovico and Gratiano are supposed to carry the news of the tragedy back to Venice. Iago is taken into custody, and his crimes will be judged back in Venice.