In "The Dragon and the Wolf" (Game of Thrones, S07E07), the Stark kids know that it wasn't Tyrion who owned Baelish's former dagger that was used to attempt to assassinate Bran. Their unsaid assumption seems to be that Petyr was behind the whole thing. However, we know in the books that it was Robert who owned the dagger which Joffery stole.
So, did Petyr's trial reveal that it was him who ordered Bran's assassination (which Bran would presumably have found out using his greensight abilities) and not Joffery, the most popular theory?