Institutional recognition (added 2026-05): The software described in this deposit is the implementation backbone of Reeco DPP Platform, which has been entered into the official UN/CEFACT UNTP Software Implementations Register via Merge Request !732 (merged April 2026). The implementation supports UNTP DPP and DCC profiles v0.6.1. UNTP conformance test results are publicly available: Reeco UNTP Test Report v1.0 — DPP 6/6 and DCC 16/16 pass against UNTP v0.6.1 using dppvalidator v0.3.2 (CIRPASS-2 reference validator). Author institutional credentials: CIRPASS-2 Expert Member (EWG1, EWG3, EWG5); JRC Registered Stakeholder (Unit B5, Seville); UNTP listed implementer; ORCID 0009-0001-3423-9402. Persistent identifiers: Wikidata Q138773743 (Reeco) and Q139669450 (Stefano Cipriani Studio); GLEIF LEI 8156007B2A5194A30603 (Stefano Cipriani Studio, Italy).

The European Union's Ecodesign for Sustainable Products Regulation (ESPR, EU 2024/1781) and the Green Claims Directive (ECGT, EU 825/2024) establish binding requirements for verified, traceable sustainability claims at product level. This paper describes algorithmic material exhaustion control — a verification mechanism that cross-checks certified material volumes declared in Transaction Certificates against actual garment production at gram-per-unit granularity, automatically blocking label issuance when certified material is mathematically exhausted. An industry audit covering 656,309 yards of production identified 44.21% non-compliant material in a real brand deployment. The paper defines the architectural requirements for compliant DPP verification and situates the approach within the regulatory obligations of ESPR, ECGT, CSRD, and CSDDD.