How can i get the Differential ID in Phabricator from a branch

I have made a commit on a particular branch and then I made a Differential patch with Arcanist (executing arc diff).

Now I forget the differential ID of this particular Differential. I want to get it back. How can I achieve this?

Solution

If you go to that branch and use the command arc which, it should tell you the Diff. Also, if you used arc diff to make the differential, the commit message of that commit should have been updated with a URL to the Diff.