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PATENT-PRIORITY.md

Priority Date Documentation — SIGIL Protocol

This file constitutes official public disclosure of the priority date claim for the SIGIL Protocol utility model patent application.

Patent Status

Status: Patent Pending
Type: German Utility Model (Gebrauchsmuster gemäß § 4 GebrMG)
Filed with: Deutsches Patent- und Markenamt (DPMA), München
Priority Date: 2026-02-23
Applicant / Inventor: Benjamin Küttner, Garmischerstrasse 46 B, 86163 Augsburg, Deutschland
Contact: benjamin.kuettner@icloud.com · ben@sigil-protocol.org

Invention Title

German:
Modulares Sicherheitsprotokoll für die Identitätsbindung, regelbasierte Inhaltsredaktion und manipulationssichere Protokollierung in vernetzten Systemen
(SIGIL — Sovereign Identity-Gated Interaction Layer)

English:
Modular Security Protocol for Identity Binding, Rule-Based Content Redaction and Tamper-Evident Audit Logging in Networked Systems

Core Claims Summary

The patent application covers the following inventive contributions:

  1. Modular Security Envelope — A composable, transport-neutral security protocol with five independently replaceable interfaces: identity provider, sensitivity scanner, vault provider, audit logger, and security policy.

  2. eIDAS-Compatible Trust Levels — Discrete, ordinal trust levels (Low / Medium / High) mapped to the eIDAS Regulation (EU) No 910/2014 assurance levels, used as first-class parameters in agent policy enforcement.

  3. Pure-Function Scanner Interface — A synchronous, side-effect-free content scanner defined as a type-level constraint (fn(&str) -> Option<Match>) that structurally prevents network I/O and state mutation, making exfiltration prevention a design-level guarantee rather than a policy-level restriction.

  4. HMAC-SHA256 Audit Chain — Every security decision is recorded as a structured, HMAC-signed entry; post-hoc modification of any field invalidates the chain.

  5. Browser Extension / Signet — A browser extension that intercepts SSE streams via ReadableStream.tee() in the MAIN JavaScript world, signs interaction receipts using an Ed25519 key isolated in a WASM sandbox, and verifies receipts against registry-registered keys.

Evidence of Development (Priority Chain)

The following public, timestamped artefacts document the development predating the priority date:

Date Evidence Verifiable
Pre-2026-02-23 GitHub commit history — sigil-rs, sigil-ts, sigil-inspector Public: github.com/sigil-eu/sigil
Pre-2026-02-23 Domain registration: sigil-protocol.org WHOIS public record
Pre-2026-02-23 registry.sigil-protocol.org live (VPS Frankfurt) DNS + server logs
Pre-2026-02-23 sigil-protocol npm package published npmjs.com
Pre-2026-02-23 crates.io: sigil-protocol v0.1.x crates.io public
2026-02-23 Einschreiben mit Rückschein — DPMA München Postal tracking receipt

EPO / PCT Deadline

Under the Paris Convention (Art. 4), a priority-claiming EPO or PCT application must be filed within 12 months of the priority date:

Deadline: 2026-02-23 — this date is informational; the actual PCT/EPO deadline is 2027-02-23.

Notice to Third Parties

Any product, service, or open-source implementation that incorporates the patented inventions listed above may be subject to licensing requirements after patent registration. For licensing enquiries, contact:

benjamin.kuettner@icloud.com · ben@sigil-protocol.org

SIGIL Protocol source code remains available under the EUPL-1.2 open-source licence. The patent covers the architectural inventions described above; it does not restrict use of the open-source implementation for non-commercial and open-source purposes under the terms of the EUPL-1.2.

Last updated: 2026-02-23