Of concern with this approach is that if the centralregistry is hacked, all the registrars' passwords could be identified and would need to be replaced.
The Central Contractor Registry (www.ccr.gov) has it registered as a news syndicate (NAICS code 519110), which is defined by NAICS as establishments who sell information to the news media.
Robosigning was just an acknowledgement that in a large, modern lending institution only the central computer registry of mortgages contains all the information about loans, and no lawyer at the periphery can possibly possess additional information beyond what is in that registry.