Stir together in a mixing bowl or the bowl of a stand mixer, the gluten free sourdough starter, the warm water, yeast and sugar. Add the tapioca starch, the Ryze flour, gluten free flour, and salt. Mix by hand until well combined or in the stand mixer on medium speed for 4 minutes.
Mix together the seeds and garlic. Add the seed mixture and the molasses to the dough and mix until just combined.
Let rest for 30 minutes. On a well floured board, with gluten free flour, stretch and fold over several times and form into a ball. Place in a greased bowl and cover with a towel and let rise for 1 1/2 - 2 hours, until puffy and risen*. *Note: the dough will not rise as gluten containing bread will, but it should be noticeably risen by maybe a third. Punch down and form into a round ball and place in a floured bread basket (or a bowl lined with a damp towel). Let rise for another 2 hours covered with a towel.
Preheat oven to 475 degrees with rack in the center of oven.
Turn out the dough unto a large piece of parchment. Brush the top with the egg white wash cover with the topping seed mixture. Using a very sharp knife, make 3 or 4 slits, 1/2 " deep on the top of the dough.
Lower the bread dough into a Dutch Oven. Cover and place in the oven. Reduce oven temperature to 450 and bake for 30 minutes. Uncover and bake for 20 - 25 more or until a thermometer registers 209 when inserted in the center. Remove from the oven and using parchment overhang, remove the bread to a wire rack. Cool for 2 hours before slicing.