Inside the "3 Billion People" National Public Data Breach

This report analyzes an alleged massive data leak from National Public Data (NPD), describing multiple partial datasets posted publicly (including SSNs, addresses and ~134M email addresses), verifying portions of the content, explaining that headline counts are inflated by duplicate rows, noting uncertainty about the full 4TB claim and provenance, and describing downstream effects such as public postings, HIBP ingestion as an unverified breach, and an ensuing class-action lawsuit.