Over the past two weeks I've scanned the most-downloaded packages in four major ecosystems using Proof of Commitment — the same behavioral scoring tool, the same methodology, applied to npm, PyPI, Cargo, and Go. The individual findings are striking. The cross-ecosystem pattern is damning. The scoreboard I audited the 20 most-downloaded packages in each registry-based ecosystem (npm, PyPI, Cargo) and 10 top Go modules. A package scores CRITICAL when it has a sole publish-credential holder and high download volume — the structural preconditions for a credential-compromise supply chain attack. Ecosystem Scanned CRITICAL Rate CRITICAL downloads/wk npm 20 10 50% ~2.4B PyPI 20 10 50% ~2.6B Cargo 20 12 60% ~176M Go 10 0 0% — Combined across npm, PyPI, and Cargo: roughly 5.2 billion weekly downloads flow through packages where a single compromised credential could push malicious code.…