1. Key Empirical Findings (Q4 2026 Cohort)

68.4% of audited domains lack strict DMARC anti-spoofing enforcement (p=reject).

74.1% omit either Strict-Transport-Security (HSTS Preload) or a valid Content-Security-Policy.

89.2% lack SMTP TLS enforcement via /.well-known/mta-sts.txt and _mta-sts DNS records.

94.6% have no cryptographically signed /llms.txt manifest for AI search engines (Perplexity, ChatGPT Search, Claude, Google AI Overviews).

2. Reference Open-Source HSTS & MTA-STS Baseline

Strict-Transport-Security: max-age=63072000; includeSubDomains; preload X-Content-Type-Options: nosniff Referrer-Policy: strict-origin-when-cross-origin # /.well-known/mta-sts.txt version: STSv1 mode: enforce max_age: 604800

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Open-Source 2026 Security Header, MTA-STS & Ed25519 /llms.txt Benchmark Kit

1. Key Empirical Findings (Q4 2026 Cohort)

2. Reference Open-Source HSTS & MTA-STS Baseline