Whisk together the mayonnaise, sour cream, blue cheese, buttermilk, chives and garlic. Season to taste with salt and pepper in a small bowl. Cover and refrigerate until ready to serve.
For the wings:
Preheat the oven to 425 degrees. Generously oil 2 rimmed baking sheets.
Toss the wings with 2 teaspoons salt and a few grinds of pepper in a large bowl and divide them between the 2 prepared baking sheets, spreading them out into a single layer. Bake until very crispy, about 55 minutes.
Whisk the melted butter and sriracha together in a large bowl. Transfer the baked wings to the bowl and toss to coat. Serve with the dipping sauce.
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