There are two 3Dmodels of Bitcoin:
HiPoly Version - 179,185 vertices - 339,165 edges - 160,662 faces - 320,500 triangles
LowPoly Version - 576 vertices - 1,080 edges - 506 faces - 1,148 triangles
The preview images show renders with the HiPoly model and thw last 4 preview images show the LowPoly Model and how the normal maps are mapped.