In a large bowl, dissolve the starter in warm water.
Add bread flour and mix until a shaggy dough forms.
Cover and let rest for 30 minutes.
Sprinkle salt over the dough and incorporate by folding.
Perform stretch and folds every 30 minutes for 2 hours.
Cover and bulk ferment at room temperature for 8-12 hours.
Turn dough onto a floured surface and shape into a boule.
Transfer to a floured banneton, cover, and proof 1-2 hours.
Preheat oven to 475°F with Dutch oven inside.
Carefully place dough into hot Dutch oven, score the top.
Bake covered for 20 minutes, then uncovered for 25-30 minutes.
Cool completely before slicing.