Lucairn Privacy Gateway

Lucairn is an EU-based privacy gateway for AI APIs. Every request through this MCP server runs through a 3-layer PII pipeline before the upstream LLM (Claude, GPT-4o, o1/o3/o4) ever sees it: Layer 1 — known-entity matching (your tenant's named entities) Layer 2 — Presidio NER (names, emails, IBANs, addresses, phone numbers, customer IDs, …) Layer 3 — GPU-hosted custom-trained PII shield (Enterprise tier, optionally trained on your domain corpus) Detected PII is replaced with placeholders ([PERSON_1], [EMAIL_2], [IBAN_3], …) before the request reaches the upstream model. The model never receives raw personal data. Every response carries a signed Lucairn certificate (Ed25519 witness signature + RFC 3161 timestamp + Sigstore Rekor inclusion proof) that proves what was redacted, when, and by which sanitizer layer. Tiers: Developer (free) — 500 requests/month, no credit card. Placeholders returned verbatim (useful for testing the redaction surface). Pro — placeholders are re-linked back