An open specification for material passports and recovery evidence in the built environment. Each fixture, panel and chair keeps an append-only record through every owner, with two-party signed custody and measured end-of-life outcomes fed back to the people who design them.
- Spec, vocabularies and ledger: loopledger/loopledger
- Reviewing the schema (gate G0): packages/spec/REVIEW.md
- Site: loopledger.org
Status: Phase 0, under external review. Built on GS1 EPCIS 2.0, the UNTP Digital Product Passport, IFC/bSDD and ISO 20887.