As Registry Operator for the ccTLD .US, NeuStar has an agreement with the United States Department of Commerce that requires them to perform random “spot checks” on registrations in the usTLD to ensure that they comply with the US Nexus Requirements. A copy of these requirements can be found at http://www.neustar.us/policies/docs/ustld_nexus_requirements.pdf
Each week Neustar will select a random sample of registrations. You may receive a maximum of one Nexus Confirmation email per domain registration in the .US TLD. However, not all Registrants will receive a Nexus confirmation email. NeuStar will only perform spot-checks so it is possible that you may not receive a Nexus Confirmation email.