Open Crumb Sourdough Bread Recipe

Hello everyone!
Dough Formula:
Levain Build (Takes about 5-6 hours)
15 g sourdough starter
30 g bread flour
30 g water
Doguh:
255 g bread flour
70 g whole wheat flour
253 g water
7.5 g sea salt
Thanks to @fullproofbaking for this open crumb sourdough recipe.