ProductDNA
ProductDNA is the product-level identity layer for the localLOOP platform. It references constituent MaterialDNA entries and explores fields that may be relevant to EU Digital Product Passport discussions. This is an early-stage lab concept, not a DPP-ready system.
Lab-only status. Lab-only: exploratory documentation and demo evidence; not a public deployment or compliance claim.
Scope & boundaries
In scope
Draft product identifiers, passport-style fields, material-composition links, and lifecycle stage.
Out of scope
Live inventory tracking, financial settlement, or verified carbon accounting.
Status
Lab-demo concept only — no public pilots or deployments yet.
Why cities adopt ProductDNA
DPP research
Explore data fields that may be relevant to ESPR Art. 9-10; no readiness, mandate coverage, or compliance outcome is claimed.
Circular procurement
Use lab examples to discuss product condition, composition, and lifecycle fields; they do not verify procurement requirements.
Reuse scenarios
Model potential exchange scenarios for research; provenance data is illustrative and not independently verified.
Evidence fields
References to certifications can support review; they do not prevent false claims or establish conformity.
Data control
Data-control patterns are under exploration; deployments must define their own access, retention, and governance controls.
What we aim to enable
A draft product-identity model with example passport-style fields, provenance metadata, material composition references, and lifecycle information.
Identity
Example product identifiers referencing constituent MaterialDNA entries via material_ids
Passport fields
Draft fields for discussing product, certification, and regulatory metadata; no ESPR alignment is claimed.
Lifecycle stage
Condition, repair history, and end-of-life indicators
Interoperability
Compatible with Offer/Match/Transfer flows across city nodes
Data model snapshot
Current status
{
"$schema": "http://json-schema.org/draft-07/schema#",
"$id": "https://localloop.urbnia.com/projects/loop-protocol/schemas/v0.2.0/product-dna.schema.json",
"title": "ProductDNA",
"description": "Product identity and metadata schema — LOOP v0.2.0 (DPP-aligned, ESPR Art. 9-10 compatible). Products reference constituent materials via material_ids.",
"type": "object",
"required": [
"@context",
"@type",
"schema_version",
"id",
"product_category",
"name",
"condition",
"quantity",
"origin_city",
"current_city",
"available_from"
],
"properties": {
"@context": {
"description": "JSON-LD context",
"type": "string",
"enum": [
"https://localloop.urbnia.com/projects/loop-protocol/contexts/loop-v0.1.1.jsonld",
"https://localloop.urbnia.com/projects/loop-protocol/contexts/loop-v0.2.0.jsonld"
]
},
"@type": {
"description": "Object type identifier",
"type": "string",
"const": "ProductDNA"
},
"schema_version": {
"description": "Schema version for the interop flow. Emitters SHOULD use 0.2.0; receivers SHOULD accept additive minor/patch releases.",
"type": "string",
"pattern": "^0\\.[1-9]\\d*\\.\\d+$",
"examples": [
"0.2.0"
]
},
"id": {
"description": "Unique ProductDNA identifier",
"type": "string",
"pattern": "^PRD-[A-Z0-9-]{8,}$",
"examples": [
"PRD-DE-MUC-2025-LAPTOP-A1B2C3"
]
},
"product_category": {
"description": "Standardized product category",
"type": "string",
"enum": [
"furniture-office",
"furniture-residential",
"furniture-industrial",
"building-structural",
"building-fixture",
"building-hvac",
"building-electrical",
"electronics-computing",
"electronics-mobile",
"electronics-appliance",
"electronics-components",
"textile-garment",
"textile-industrial",
"packaging-reusable",
"vehicle-parts",
"equipment-industrial",
"equipment-medical"
]
},
"name": {
"description": "Product name or short description",
"type": "string",
"minLength": 2,
"maxLength": 200,
"examples": [
"Standing Desk — Ergotron WorkFit"
]
},
"condition": {
"description": "Physical condition of the product",
"type": "string",
"enum": [
"new",
"like-new",
"good",
"fair",
"poor",
"for-parts"
]
},
"quantity": {
"description": "Amount of product units",
"type": "object",
"required": [
"value",
"unit"
],
"properties": {
"value": {
"description": "Numeric quantity",
"type": "number",
"minimum": 0,
"examples": [
12,
1
]
},
"unit": {
"description": "Unit of measurement",
"type": "string",
"enum": [
"kg",
"g",
"t",
"l",
"ml",
"m3",
"piece",
"bundle"
],
"examples": [
"piece"
]
}
}
},
"origin_city": {
"description": "City that registered the product",
"type": "string",
"minLength": 2,
"maxLength": 80,
"examples": [
"Munich"
]
},
"current_city": {
"description": "City currently holding custody of the product",
"type": "string",
"minLength": 2,
"maxLength": 80,
"examples": [
"Munich"
]
},
"available_from": {
"description": "When product becomes available (ISO 8601)",
"type": "string",
"format": "date-time",
"examples": [
"2026-03-15T08:00:00Z"
]
},
"expires": {
"description": "When product listing expires (ISO 8601)",
"type": "string",
"format": "date-time"
},
"manufacturer": {
"description": "Product manufacturer name",
"type": "string",
"maxLength": 200,
"examples": [
"Ergotron"
]
},
"model": {
"description": "Product model name or number",
"type": "string",
"maxLength": 200,
"examples": [
"WorkFit-S"
]
},
"manufacture_year": {
"description": "Year of manufacture",
"type": "integer",
"minimum": 1900,
"examples": [
2021
]
},
"serial_number": {
"description": "Product serial number",
"type": "string",
"maxLength": 120
},
"functional_status": {
"description": "Functional state of the product",
"type": "string",
"enum": [
"fully-functional",
"partially-functional",
"non-functional",
"untested"
]
},
"lifecycle_stage": {
"description": "Current stage in product lifecycle (ESPR/UNTP aligned)",
"type": "string",
"enum": [
"production",
"in-use",
"end-of-first-use",
"refurbished",
"end-of-life"
]
},
"material_ids": {
"description": "References to constituent MaterialDNA identifiers (composition link)",
"type": "array",
"items": {
"type": "string",
"pattern": "^MAT-[A-Z]{2}-[A-Z]{3}-\\d{4}-[A-Z]+-[A-Z0-9]{6,}$"
},
"examples": [
[
"MAT-DE-MUC-2025-METAL-4EB84C",
"MAT-DE-MUC-2025-PLASTIC-96FE78"
]
]
},
"dimensions": {
"description": "Physical dimensions of the product",
"type": "object",
"properties": {
"length_cm": {
"description": "Length in centimeters",
"type": "number",
"minimum": 0
},
"width_cm": {
"description": "Width in centimeters",
"type": "number",
"minimum": 0
},
"height_cm": {
"description": "Height in centimeters",
"type": "number",
"minimum": 0
},
"weight_kg": {
"description": "Weight in kilograms",
"type": "number",
"minimum": 0
}
}
},
"images": {
"description": "Photos of the product",
"type": "array",
"items": {
"type": "string",
"format": "uri"
},
"maxItems": 10
},
"reuse_potential": {
"description": "Free-text notes on reuse potential and condition details",
"type": "string",
"maxLength": 500,
"examples": [
"Fully functional standing desks from office clearance. Minor cosmetic wear."
]
},
"certifications": {
"description": "List of certifications",
"type": "array",
"items": {
"type": "string"
}
},
"location": {
"description": "Geographic location of product",
"type": "object",
"required": [
"lat",
"lon"
],
"properties": {
"lat": {
"description": "Latitude",
"type": "number",
"minimum": -90,
"maximum": 90
},
"lon": {
"description": "Longitude",
"type": "number",
"minimum": -180,
"maximum": 180
},
"address": {
"description": "Human-readable address",
"type": "string"
}
}
},
"contact": {
"description": "Reserved. Personal contact details are not permitted in minimal interop payloads.",
"not": {}
},
"passport": {
"description": "Optional regulatory interoperability metadata for DPP-style integrations (ESPR Art. 9-10, UNTP ProductPassport aligned).",
"type": "object",
"properties": {
"passport_id": {
"type": "string",
"maxLength": 160
},
"passport_url": {
"type": "string",
"format": "uri"
},
"backup_copy_url": {
"type": "string",
"format": "uri"
},
"passport_status": {
"type": "string",
"enum": [
"not_applicable",
"optional",
"required",
"available",
"restricted"
]
},
"data_carrier_id": {
"type": "string",
"maxLength": 160
},
"issued_at": {
"type": "string",
"format": "date-time"
},
"issuer_node": {
"type": "string",
"maxLength": 160
},
"access_scope": {
"type": "string",
"enum": [
"public",
"role-based",
"restricted"
]
},
"visible_to": {
"description": "Minimum audience tier this passport data is intended for, on a cumulative public < operator < regulator scale (each wider tier sees at least what the narrower one sees). Refines access_scope's role-based/restricted values without replacing them; modeling guidance only, not an enforced access-control mechanism. See docs/access-scope-model.md.",
"type": "string",
"enum": [
"public",
"operator",
"regulator"
]
},
"supported_regimes": {
"type": "array",
"items": {
"type": "string",
"enum": [
"espr-dpp",
"battery-passport",
"ppwr",
"waste-shipment",
"nkws"
]
}
},
"gtin": {
"description": "GS1 Global Trade Item Number",
"type": "string",
"pattern": "^\\d{8,14}$"
},
"gs1_digital_link": {
"description": "GS1 Digital Link URL",
"type": "string",
"format": "uri"
},
"economic_operator_id": {
"description": "ESPR economic operator identifier",
"type": "string",
"maxLength": 120
},
"economic_operator_name": {
"description": "ESPR economic operator name",
"type": "string",
"maxLength": 200
},
"manufacturer_id": {
"description": "Manufacturer identifier",
"type": "string",
"maxLength": 120
},
"country_of_production": {
"description": "ISO 3166-1 alpha-2 country code of production",
"type": "string",
"pattern": "^[A-Z]{2}$"
},
"conformity_declaration_ref": {
"description": "EU Declaration of Conformity link",
"type": "string",
"format": "uri"
},
"carbon_footprint_kg_co2e": {
"description": "Carbon footprint per declared unit (kg CO2e)",
"type": "number",
"minimum": 0
},
"carbon_footprint_unit": {
"description": "Declared unit for carbon footprint",
"type": "string"
},
"recycled_content_percent": {
"description": "Percentage of recycled content (ESPR & PPWR)",
"type": "number",
"minimum": 0,
"maximum": 100
},
"recyclable_content_percent": {
"description": "Percentage of recyclable content (UNTP circularity)",
"type": "number",
"minimum": 0,
"maximum": 100
},
"repair_score": {
"description": "Repairability index 0-10 (ESPR)",
"type": "number",
"minimum": 0,
"maximum": 10
},
"durability_score": {
"description": "Durability rating 0-10",
"type": "number",
"minimum": 0,
"maximum": 10
},
"disassembly_instructions": {
"description": "Link to disassembly information",
"type": "string",
"format": "uri"
},
"substances_of_concern": {
"description": "Substances of Concern declarations (ESPR)",
"type": "array",
"items": {
"type": "object",
"required": [
"name"
],
"properties": {
"name": {
"type": "string"
},
"cas_number": {
"type": "string",
"pattern": "^\\d{1,7}-\\d{2}-\\d$"
},
"concentration_ppm": {
"type": "number"
},
"location": {
"type": "string"
}
}
}
},
"hazardous": {
"description": "Hazardous product flag",
"type": "boolean"
},
"material_safety_info_url": {
"description": "Material safety data sheet URL",
"type": "string",
"format": "uri"
},
"verified_ratio": {
"description": "UNTP data verification coverage (0.0 to 1.0)",
"type": "number",
"minimum": 0,
"maximum": 1
},
"verification_evidence_url": {
"description": "Link to verification attestation",
"type": "string",
"format": "uri"
}
},
"additionalProperties": true
},
"traceability": {
"description": "Optional chain-of-custody, retention, and evidence references.",
"type": "object",
"properties": {
"batch_id": {
"type": "string",
"maxLength": 120
},
"serial_number": {
"type": "string",
"maxLength": 160
},
"lot_number": {
"type": "string",
"maxLength": 120
},
"epcis_event_refs": {
"description": "ISO 19987 (EPCIS) event references for supply chain traceability",
"type": "array",
"items": {
"type": "object",
"required": [
"event_type",
"event_id"
],
"properties": {
"event_type": {
"type": "string",
"enum": [
"observation",
"aggregation",
"transaction",
"transformation"
]
},
"event_id": {
"type": "string"
},
"event_url": {
"type": "string",
"format": "uri"
},
"hash_digest": {
"type": "string"
},
"hash_method": {
"type": "string",
"enum": [
"SHA-256",
"SHA-384",
"SHA-512"
]
}
}
}
},
"chain_of_custody_url": {
"type": "string",
"format": "uri"
},
"w3c_vc_credential_id": {
"type": "string",
"format": "uri"
},
"w3c_vc_issuer": {
"type": "string",
"format": "uri"
}
},
"additionalProperties": true
},
"conformity_claims": {
"description": "UNTP-aligned conformity claims for regulatory and standards compliance.",
"type": "array",
"items": {
"type": "object",
"required": [
"claim_id"
],
"properties": {
"claim_id": {
"type": "string"
},
"description": {
"type": "string"
},
"reference_standard": {
"type": "string"
},
"reference_regulation": {
"type": "string"
},
"conformity_topic": {
"type": "string",
"enum": [
"environment",
"social",
"governance",
"safety",
"quality"
]
},
"declared_value": {
"type": "object",
"properties": {
"metric": {
"type": "string"
},
"value": {
"type": "number"
},
"unit": {
"type": "string"
},
"accuracy": {
"type": "number"
}
}
},
"conformance": {
"type": "boolean"
},
"assessment_date": {
"type": "string",
"format": "date-time"
},
"conformity_evidence_url": {
"type": "string",
"format": "uri"
}
}
}
},
"metadata": {
"description": "Additional metadata",
"type": "object",
"additionalProperties": true
}
},
"additionalProperties": true
}