We're researching how to efficiently design a system that would enable this kind of a spatial data registry, along with requirements. We're trying to work out exactly what the needs might be and anticipate that this will emerge as a contract standard. We can imagine many variations of this type of contract deployed, each storing its own registry of polygons - for mobility apps, administrative jurisdictions, maritime governance zones, restricted airspace, watersheds and so on. The initial design will be tailored to registering geographic zones (i.e. polygons). Use cases will likely emerge that require the registration of other spatial data assets like points and lines, or raster datasets such as satellite images and LIDAR scans; we will consider these, but focus on our core use case of a zone registry.