Combine seed mix for topping and soak ½ cup water with the seed mixture for the bread; let sit 30 minutes to overnight.
Mix flours, yeast, honey, melted butter, oats, and salt in a stand mixer; knead 6-8 minutes until elastic.
Add the soaked seed mixture and water; mix until seeds are incorporated. Let dough rise 1-1.15 hours until doubled.
Preshape, shape into loaves, and let rest 10 minutes. Final shape into logs, coat with beaten egg white, then roll in seed topping.
Place in loaf pans, let rise 45-60 minutes, then bake at 375°F (190°C) for 35-40 minutes until golden and internal temp reaches 185°F (85°C). Cool before slicing.
Notes
Ensure the dough is elastic and passes the windowpane test for proper gluten development.