Changelog

The changelog captures updates to the protocol and planned roadmap items. The project is early-stage with no public pilots yet.

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How updates ship

Changes follow the RFC process and are communicated in releases.

RFC review

Proposals are reviewed before adoption

Versioning

Tracked by semantic changelog entries

Changelog

All notable changes to the LOOP specification will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

Unreleased

0.2.0 - 2026-03-08

Added

Comprehensive DPP extension fields in MaterialDNA passport block (GTIN, economic operator, carbon footprint, recycled content, repair score, substances of concern, hazardous flag, verified ratio)
Classification extensions (PRODCOM, TARIC, NACE, SCIP, Waste Framework codes)
Traceability extensions (EPCIS event references, chain of custody URL, W3C VC credential ID/issuer)
Conformity claims top-level array (UNTP-aligned: claim ID, standards, regulations, topics, declared values, evidence)
Transfer schema extensions (traceability, passport subset, waste shipment doc ref, environmental conditions)
JSON-LD context v0.2.0 with all 16+ type mappings and 30+ DPP term mappings
RFC-0003: Schema Versioning Policy
DPP extension example (12-material-dna-dpp-extensions.json)
Conformity claims example (13-conformity-claims.json)
LICENSES/ directory with MIT.txt and CC-BY-SA-4.0.txt
ESPR (EU) 2024/1781, UNTP DPP, and Germany NKWS references

Changed

Unified all 10 schemas under v0.2.0 (eliminated v0.1.1/v1 split)
Widened schema_version pattern to accept 0.x.y (both 0.1.1 and 0.2.0)
Changed @context from const to enum (accepts both v0.1.1 and v0.2.0)
Changed additionalProperties from false to true on v1-origin schemas
Added optional schema_version to LoopCoin, LoopSignal, Transaction, NodeInfo schemas
Clarified dual batch fields (metadata.batch_number vs traceability.batch_id)
Updated specification header to v0.2.0 with DPP-Compatible Lab Baseline status
License clarified as dual: MIT for code, CC BY-SA 4.0 for specification prose
Renumbered examples: 09-material-status → 10, 10-handshake-response → 11
Backend API paths aligned to /api/v1/ to match specification

Fixed

Green Claims Directive hallucination: corrected to withdrawn June 2025
Stale BMUV URL: updated to bundesumweltministerium.de (ministry renamed to BMUKN)
Removed stale future release dates (0.2.0 "Q3 2025", 0.3.0 "Q4 2025", 1.0.0 "Q1 2026")
Removed invalid JSON comments in specification Section 12 examples
Updated specification date from December 2025 to March 2026

0.1.1 - 2025-12-20

Added

Minimal interop flow definition (MaterialDNA → Offer → Match → Transfer) for lab demos
JSON schemas for Offer, Match, and Transfer (v0.1.1)
v0.1.1 examples for lab demo payloads
MaterialDNA schema versioning field for interop validation

Changed

MaterialDNA example payloads updated for schema version 0.1.1
Documentation updates to clarify lab-only scope and demo status

Security

Added STRIDE-lite and GDPR data-minimization notes in the security guide

0.1.0 - 2025-05-27

Added

Initial LOOP specification v0.1
Core protocol definition with four main components:
- MaterialDNA universal identification system
- LoopCoin expiring local currency specification
- LoopSignal democratic preference mechanism
- LoopCost calculation methodology
RESTful API endpoint specifications
Federation protocol for node-to-node communication
JSON-LD context definitions
Security requirements and considerations
Implementation guidance for node operators
Comprehensive examples of material flows
Standard material category taxonomy
Node discovery and authentication mechanisms

Changed

N/A (initial release)

Deprecated

N/A (initial release)

Removed

N/A (initial release)

Fixed

N/A (initial release)

Security

Established TLS 1.3 as minimum requirement
Defined authentication mechanisms for users and nodes
Set rate limiting recommendations
Created security audit trail requirements

0.0.9-draft - 2025-05-15

Added

Draft specification for community review
Basic MaterialDNA format proposal
Initial LoopCoin concept
Preliminary API endpoint design

Notes

Internal draft - not publicly released
Used for initial stakeholder feedback

0.0.1-concept - 2025-04-01

Added

Original concept document
Problem statement
High-level architecture vision

Notes

Conceptual phase - no implementation details
Inspired by ActivityPub and Carlsson & Nevzorova (2025)

Version History Summary

Version	Date	Status	Key Changes
0.2.0	2026-03-08	Current	DPP extensions, schema consolidation, context completion
0.1.1	2025-12-20	Superseded	Minimal interop lab demo baseline
0.1.0	2025-05-27	Superseded	Initial public release
0.0.9-draft	2025-05-15	Superseded	Internal draft
0.0.1-concept	2025-04-01	Archived	Concept document

Upgrade Guide

From concept to 0.1.0

This is the first implementable version. Key changes:

Formal API specifications added
Security requirements defined
Federation protocol established
MaterialDNA format finalized

Future Direction

Future releases may include:

Smart contract integration (see RFC-0004)
IoT and sensor integration
Profile-based extension guidance for product-specific DPP delegated acts
Conformance test suites for additive patch releases
Advanced routing and batch operations

Maintenance

This changelog is maintained by the LOOP core team.

How to contribute:

Fork the repository
Add your changes under [Unreleased]
Follow the Keep a Changelog format
Submit a pull request

Changelog update checklist: