Digital Product Passports — minimal adoption for EU compliance and circular-economy grounding

[Argocyte]

Digital Product Passports — Minimal Adoption for EU Compliance and Circular-Economy Grounding

Source: EU Ecodesign for Sustainable Products Regulation (ESPR, 2024) | Corporate Sustainability Reporting Directive (CSRD)
Standards bodies: GS1 Digital Link, W3C Verifiable Credentials, CEN-CENELEC, ISO
Assessment status: Recommend minimal adoption — upgrade existing CSV template, defer full schema until EU standard stabilises (~2026–2027)

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What Digital Product Passports Are

A DPP is a structured, machine-readable record permanently attached to a physical product containing:

• Material composition — what it's made of, recycled content percentage
• Supply chain provenance — where materials originated, who processed them
• Repair and maintenance — instructions, spare parts availability, repairability index
• End-of-life — recycling instructions, disassembly guide, disposal route
• Circularity metrics — durability score, recycled content %, carbon footprint

The EU is mandating DPPs by product category under ESPR:

• Batteries — February 2027 (the "Battery Passport", already has a working group)
• Textiles — 2028 (high relevance if IskanderHearth produces clothing/fabric goods)
• Electronics — 2028–2029
• Construction materials — 2029–2030

DPPs must be machine-readable (JSON-LD or GS1 Digital Link QR), tamper-evident, and accessible to regulators, recyclers, and consumers. The legal requirement is that the DPP "travels with the product" — passed on at every transfer of ownership.

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Iskander Already Has a Proto-DPP

src/IskanderHearth/supply_chain/material_passport_template.csv is in the repository. This is a proto-DPP: it captures material composition and supply chain in CSV format. The infrastructure gap is:

1. Format — CSV is not machine-readable by DPP-reading systems; needs JSON-LD
2. Anchoring — not IPFS-anchored; no tamper-evidence
3. Coverage — CSV covers materials but not repair instructions, circularity metrics, or end-of-life
4. Transfer — no mechanism to pass the DPP when an asset transfers ownership within the federation

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What Minimal Adoption Looks Like

Phase 1 (now — minimal, ~1 week):

Upgrade the existing template from CSV to JSON-LD. Keep the minimal field set — don't try to cover every DPP field before the standard settles.

{
  "@context": [
    "https://gs1.org/voc/",
    "https://www.w3.org/2018/credentials/v1",
    "https://iskander-hearth.coop/ns/dpp/v1"
  ],
  "@type": ["ProductPassport", "VerifiableCredential"],
  "id": "ipfs://Qm...",
  "issuer": "did:ethr:0x...",
  "issuanceDate": "2026-04-10",
  "credentialSubject": {
    "gs1:gtin": "optional — if product has GTIN",
    "iskander:assetId": "uuid",
    "iskander:assetName": "Workshop bandsaw",
    "gs1:material": [
      {"gs1:materialCode": "steel", "gs1:recycledContentPercent": 40}
    ],
    "iskander:repairInstructions": "ipfs://Qm...",
    "iskander:sparePartsAvailable": true,
    "iskander:disposalRoute": "metal recycling",
    "iskander:carbonFootprintKg": 45.2,
    "iskander:durabilityYears": 20
  }
}

IPFS-anchoring gives the tamper-evidence requirement for free — the CID is the integrity proof.

Phase 2 (when EU standard stabilises, ~2026–2027):

Align with the Battery Passport technical standard (the first one to stabilise, Feb 2027). Adopt GS1 Digital Link QR code format. Implement full ESPR fields for the product categories IskanderHearth actually produces.

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Every Managed Asset Gets a DPP

The Estates Warden and Quartermaster agents manage Iskander's physical asset inventory. Every asset they track should have a DPP:

• Workshop tools (drill press, lathe, 3D printer)
• Vehicles (vans, cargo bikes)
• Estates plant (HVAC, solar panels, structural elements)
• Manufactured outputs (if IskanderHearth sells products)

When an asset is transferred within the federation (e.g., cooperative A loans a tool to cooperative B), the DPP transfers with it. The Quartermaster agent updates the issuer field and adds a transfer event to the DPP's history.

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Circular Economy Grounding

ADR 0001 states the mutual credit spec "grounds credits in real material flows, not speculative demand." DPPs are the data artefact that makes "real material flows" auditable. Without a DPP, a credit representing "recycled content" is an assertion. With a DPP, it's a verifiable claim.

This matters for the GTFT federation's trust protocol: if cooperative A makes a trade claim about a product's material composition, cooperative B can verify it against the product's DPP (IPFS-anchored, tamper-evident, issuer-signed).

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Assessment

Dimension	Rating	Notes
Implementation cost	Medium	JSON-LD upgrade + IPFS anchoring; ~1 week minimal; churn risk until 2027
Regulatory benefit	High	Legal requirement for EU products 2027–2030; starting now avoids scramble
Circular economy	High	Makes "real material flows" auditable, not just asserted
Risk of adopting	Medium	Standards in flux — plan for one schema revision before 2027
Risk of skipping	High	Regulatory scramble + no material-flow audit trail
Aligns with FOSS-first	Yes	GS1/W3C/JSON-LD are open standards
Aligns with ADR 0001	Yes	Direct implementation of "grounded in real material flows"

Recommendation: Adopt minimal subset now. Upgrade material_passport_template.csv to JSON-LD, IPFS-anchor it, track in ops-data. Revisit full schema when Battery Passport standard settles in 2026–2027.

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Active Implementations to Monitor

Project	What they've built	Iskander relevance
Battery Pass Consortium (Germany)	Full battery DPP schema, GS1 Digital Link	Schema reference for electronics
CIRPASS (EU research)	Cross-sector DPP architecture	Architecture reference
Madaster (Netherlands)	Building material passports	Construction materials
Sourcemap	Supply chain transparency	Supply chain provenance field

None are FOSS — but their schemas are published and reusable.

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Related Issues Being Filed

• feat(quartermaster): Upgrade material_passport_template.csv to DPP JSON-LD schema with IPFS anchoring
• feat(ops-data): DPP record alongside asset records — transfer tracking at asset ownership change

See also: src/IskanderHearth/supply_chain/material_passport_template.csv | ADR 0001 (mutual credit grounding)

[Argocyte]

Phase C.5 coordination — 2026-04-11

Phase C.5 has two implementation vehicles for this research: Q2 Quartermaster (#136) implements the DPP upgrade of material_passport_template.csv (via #122); Q4 Estates Warden (#138) adds assets.dpp_cid (via #123). Conditional on DPP adoption decision from this discussion.