I will teach this in my upcoming “Blind Blake” ebook (tab + video) https://www.daddystovepipe.com/blind-blake-ebook.php
Key of C, standard tuning however tuned down a half step
Listen to Blake’s initial https://www.youtube.com/watch?v=Q2bR-fCenw4
and an outstanding modern variation by British artist Roger Hubbard

I’m playing a copy of a 1934 Gibson L00 made by John Greven