Preheat the oven to 350 degrees and grease a 9-inch bread pan and dust it with flour. In a large bowl, mix 4 cups of flour with the baking powder, baking soda, salt, sugar, and seeds. Add the buttermilk to the bowl and mix with a fork until the mixture forms a dough.

Sprinkle flour on a board. Turn out the dough and knead for about 5 minutes, working in the flour from the board and forming the dough into a smooth round loaf about 8 inches in diameter. Press the dough evenly into the pan and cut an "x" about 1/2 inch deep across the top.

Bake for 1 and a quarter hours or until the loaf sounds hollow when tapped on the bottom. Move the loaf onto a wire rack and brush the top with butter. 

Serve warm with soft Irish butter.  Break off chunks or slice.