Digital chain of custody remains a frequently litigated and consequential vulnerability in forensic evidence proceedings. Existing frameworks — NIST SP 800-86, ISO/IEC 27037, the ACPO Good Practice Guide — establish procedural requirements for evidence handling but share a foundational architectural feature: chain of custody is implemented as a procedural record appended to evidence after collection, making its integrity dependent on the conduct of collecting officers and the reliability of documentary processes external to the evidence itself. This paper argues that the Modulign Standard — a Dimensional Address Grammar for Observable Reality (DAG-OR) — addresses this vulnerability at its structural root by integrating chain-of-custody documentation into the evidence-grade registration event itself, rather than maintaining it as a separable procedural layer. Under the Modulign EVID protocol, chain of custody is not a procedural record attached to an observation after the fact: it is architecturally embedded in the observation’s classification act. The append-only ledger, cryptographic signature chain, and observer competence gate collectively make chain-of-custody documentation a structural property of evidence-grade registration within the Modulign system rather than a compliance artefact maintained alongside it. The paper demonstrates that Modulign-classified digital evidence provides a strong formal basis for satisfying the authentication requirements of Federal Rule of Evidence 901 (b) (9), supports compliance with the integrity requirements of ISO/IEC 27037, and materially strengthens defensibility under the preservation obligations of Zubulake v. UBS Warburg (S. D. N. Y. 2003) and Federal Rule of Civil Procedure 37 (e) — through architectural properties rather than procedural compliance steps alone. The Modulign Standard is a published specification. It has not yet been independently validated through empirical testing, adopted by a recognised standards body, or subjected to adversarial scrutiny in legal proceedings. This paper’s claim is that the formal architecture is logically sound, that it addresses a genuine and recurring vulnerability in digital evidence practice, and that it is designed to operate within — not to replace — existing evidentiary doctrine.
Vincent Gonzalez (Sat,) studied this question.