$ A high-quality, professional 3D render icon of a closed padlock. The padlock body is made of vibrant, smooth, soft-textured azure-blue plastic with rounded, plump edges. Centered on the front face of the lock body is a detailed, relief-embossed golden-yellow Bitcoin symbol (₿). The U-shaped shackle is made of smooth, matte metallic silver. The entire lock is shown in a clean isometric perspective, set against a solid, smooth pastel-blue background. Soft, diffused studio lighting highlights the rounded forms, creating gentle, clean shadows. The design is minimalist, clean, and friendly, like a high-end UI icon.