For the cornbread: Preheat the oven to 425 degrees F. Lightly grease an 8-inch baking dish.
Mix together the cornmeal, flour, sugar, baking powder, baking soda and salt in a large bowl.
In a separate bowl, mix together the eggs, buttermilk and melted butter. Pour the buttermilk mixture into the cornmeal mixture and fold together until there are no dry spots (the batter will still be lumpy). Pour the batter into the prepared baking dish.
Bake until the top is golden brown and a tester inserted into the middle of the cornbread comes out clean, 20 to 25 minutes. Remove the cornbread from the oven and let it cool for 10 minutes before serving.
For the fried chicken: Combine the buttermilk and sriracha with a fork in a large bowl and season with salt and black pepper. Add the chicken and let soak.
Mix the flour, garlic powder, onion powder, paprika and cayenne until well blended in a large shallow platter. Season generously with salt and pepper.
Remove the chicken and dredge the pieces a few at a time in the flour mixture, then into the buttermilk and finishing in the seasoned flour. Set aside and let the chicken rest while the oil comes to temp. This also allows the breading to develop.
Put about 3 inches of oil into a large deep pot; it should not come up more than halfway. Heat over medium-high heat until the oil registers 350 to 365 degrees F on one of those clip-on deep-fry thermometers.
Once the oil has reached 350 to 365 degrees F, working in batches, carefully add the chicken pieces 3 or 4 at a time. Fry, turning the pieces once, until golden brown and cooked through, about 12 minutes. Total cooking time should be about 30 minutes per batch.
When the chicken is done, take a big skimmer and remove the chicken pieces from the pot, shaking off as much oil as you can, and lay it on a tea towel or brown paper bag to soak up the oil.
Sprinkle all over with more salt and a dusting of black pepper. Repeat with the remaining chicken pieces.
For the dipping sauce: Combine the buttermilk, mayonnaise, sour cream, sriracha, black pepper, Worcestershire sauce, garlic and chives together in a small bowl.
Once all the chicken is fried, serve hot with lemon wedges, cornbread and buttermilk sriracha dipping sauce.