In the Rambam's introduction to the Mishneh Torah, he claims he received a direct transmission of the true rabbinic tradition from the academies of Babylonia to him and traces it.
For Ashkenazim, is there a similar text somewhere from some rabbi that does the same thing for the Ashkenazi tradition? I am looking for a source that says something like: I (insert Ashkenazi rabbi) received the tradition from .... who is traced to .... the academies of Babylonia (or Eretz Yisrael)...
Thus, similar text to the Rambam's introduction but from the Ashkenazi side.
Does such a text tracing the Ashkenazi tradition exist?