Simply getting RegistryName was enough.
Tho it raises more questions. Does registry name always link to a texture resource? What about animations and vertice data?
I will have to google up more info on that topic.
None of them. Resource paths are interpreted, not hard coded. It's formed via concatenation of $domain + ":" + $block_registry_name and later is it parsed to locate the actual file.
ALL assets are referenced this way.