In a large bowl, mix the starter and water with a dough whisk. Add bread flour and salt. Mix until the dough forms. It will be shaggy
Cover bowl with lid or damp towel to bulk ferment for 3-12 hours until dough is proofed. The dough should be round, smooth, with bubbles on top, and should wiggle when you shake the bowl.
Shape on a floured countertop. Place in a floured banneton basket, cover with plastic wrap on the counter for one hour.
Place in fridge for cold ferment for 15 hours.
Dump the loaf on parchment paper or a silicone sling. Score the dough however you choose and place the dough in a Dutch oven and put the lid on it.
Place Dutch oven in oven. Set oven to 450 degrees and set timer for 1 hour.
Remove Dutch oven from oven, take lid off the Dutch oven, lower oven temperature to 425, place Dutch oven back in oven, and bake for another 10-15 minutes.
Remove Dutch oven from oven, remove the loaf from Dutch oven, and place on cooling rack.
Cool for 1-4 hours before slicing.
Enjoy!