How Textile Suppliers Prove Chain of Custody: A Practical Guide to Transaction Certificate Management for GRS and GOTS Certified Fabrics
Updated: Jul 28
A Transaction Certificate (TC) is the single document that converts a supplier's certification claim into verified proof. For any fabric sold under GRS or GOTS, the TC is what makes the claim legally defensible, brand-safe, and audit-ready. Without it, certifications printed on a product data sheet are unverifiable marketing. With it, every meter of fabric can be traced back to its certified origin. This guide explains exactly how TC management works, where suppliers commonly fail, and what best-in-class chain of custody documentation looks like in practice.
TL;DR
A Transaction Certificate (TC) is issued per shipment and proves that a specific sale of certified material complies with GRS or GOTS standards.
Chain of custody documentation must cover every handoff in the supply chain, not just the final fabric seller.
GRS and GOTS certification requirements differ significantly in scope, auditing frequency, and what the TC must contain.
Common TC failures include scope mismatches, expired certificates, and missing input TCs from upstream suppliers.
Brands that demand TC management from suppliers reduce compliance risk and protect their sustainability claims from greenwashing accusations.
What Is Chain of Custody in Textile Supply Chains?
Chain of custody (CoC) in textiles is the documented, verifiable sequence of ownership and handling that a material undergoes from raw fiber to finished product. According to Ellie Connect, chain of custody is specifically defined as "the ability to trace the change in legal ownership of the product as it moves along the supply chain" and is distinct from physical traceability, which tracks where a product has been geographically.
This distinction matters. A fabric can physically travel through five facilities, but if the legal ownership transfer at each step is not documented, the chain of custody is broken. As Logility notes, "Fashion brands must demonstrate that their chain of custody not only exists but is also accurate, authentic and responsible." The word "accurate" is doing significant work here. A CoC that exists on paper but cannot be verified against actual shipment data is a compliance liability, not an asset.
For certified fabrics, chain of custody documentation is the mechanism that connects the certification to the physical product. It answers one question: can you prove this specific roll of fabric came from a certified source?
What Are GRS Certification Requirements for Transaction Certificates?
The Global Recycled Standard (GRS) certifies that a product contains a verified percentage of recycled material. A GRS transaction certificate is a shipment-level document issued by an accredited certification body confirming that a specific sale meets GRS content requirements.
Key GRS certification requirements for TC management include:
Scope certificate first: The seller must hold a valid GRS scope certificate before any TC can be issued. The scope certificate defines which products and processes are covered.
Input TC required: The seller must hold a valid input TC from their own supplier before issuing an output TC to their buyer. This creates the chain.
Minimum recycled content: Products must contain at least 20% recycled material to use the GRS label; 50% or more is required to carry the GRS logo on the product.
Mass balance or physical separation: The TC must reflect which tracking method was used to account for certified material in production.
TC validity: A GRS TC is valid only for the specific transaction it covers. It cannot be reused or transferred to another shipment.
What Are GOTS Certification Requirements for Transaction Certificates?
The Global Organic Textile Standard (GOTS) certifies organic fiber content and requires social and environmental processing criteria throughout the supply chain. A GOTS transaction certificate is more demanding than its GRS equivalent because it requires compliance at every processing stage, not just material content verification.
Key GOTS certification requirements include:
Annual on-site audits: Every certified entity in the supply chain must undergo a physical audit annually, not just a document review.
Input TC obligation: A GOTS TC can only be issued if the seller holds a valid input TC from the previous certified entity. No input TC means no output TC can be issued.
Two-grade system: Products can be labeled "organic" (minimum 95% certified organic fiber) or "made with organic" (minimum 70%). The TC must specify which grade applies.
Processing criteria: Unlike GRS, GOTS restricts which chemicals and dyes can be used during fabric processing. The TC implicitly certifies that these criteria were met.
Public database verification: All valid GOTS scope certificates and TCs are publicly searchable, making verification straightforward for brands and auditors.
How Do GRS and GOTS Transaction Certificates Compare?
Feature | GRS TC | GOTS TC |
What it certifies | Recycled content percentage | Organic fiber content + processing criteria |
Minimum certified content | 20% recycled | 70% organic (for "made with organic" label) |
Audit type | Document-based or on-site | Mandatory annual on-site audit |
Input TC required | Yes | Yes |
Public verification | Via certification body database | Via GOTS public database |
Processing restrictions | No | Yes (restricted substance list) |
Social criteria | Limited | Comprehensive (ILO conventions) |
Where Do Textile Suppliers Most Commonly Break the Chain of Custody?
Supply chain traceability failures are rarely intentional. They are structural. As highlighted in a FASH455 case study on ASKET, "the apparel supply chain is far more complicated than the commonly known four stages." Certified fabric passes through fiber producers, spinners, weavers, dyers, finishers, and traders before reaching a brand. Each handoff is a potential break point.
The most common failure modes include:
Scope certificate gaps: A supplier holds a TC from their upstream source but has not certified their own processing step. Their output TC is therefore invalid.
Expired input TCs: Suppliers accept fabric against a TC that was valid at the time of purchase but has since expired. The downstream TC they issue is then unsupported.
Scope mismatch: The supplier's scope certificate covers yarn but not fabric. They sell certified fabric anyway, and the TC is technically outside their certified scope.
Blending without tracking: Certified and non-certified material is mixed in production without proper mass balance records, invalidating any TC claim for the blended output.
Trader-level gaps: A trading company buys certified fabric but is not itself certified. It cannot legally issue a TC to its buyer, breaking the chain entirely.
Research published on Semantic Scholar on blockchain in textile supply chains identifies information asymmetry between supply chain tiers as a core vulnerability. Each tier knows its own data but not the full picture, which is precisely why TC management requires a system, not just a filing cabinet.
What Does Best-Practice TC Management Look Like for Fabric Suppliers?
Effective chain of custody documentation is proactive, not reactive. Suppliers who manage TCs well treat them as operational documents, not compliance paperwork filed after the fact.
Step-by-Step TC Management Process
Verify input TC before accepting delivery. Before goods arrive, confirm the supplier's scope certificate is active and the input TC covers the specific product and quantity.
Log the input TC against your inventory. Link the TC number to the physical stock lot. Every roll or batch should be traceable to a specific TC.
Confirm your own scope certificate covers the transaction. Check that your certified scope includes the product type, process step, and certification standard before issuing any output TC.
Apply for the output TC before or at the time of shipment. Submit the TC application to your certification body with accurate quantity, product description, and buyer details.
Transmit the TC to the buyer with the shipment documentation. The TC should accompany the commercial invoice. Brands cannot use the fabric in certified products without it.
Archive all TCs with cross-references. Each output TC should be linked to its input TC in your records. Auditors will request this chain during certification renewal.
As Intertek notes, "Brands must work closely with vendors to promote transparency, ensuring that everyone benefits from clear sourcing practices." This is not a one-directional demand from brands. Suppliers who manage TCs well create commercial advantages for themselves: faster brand approvals, fewer audit delays, and stronger long-term partnerships.
Frequently Asked Questions
Can a fabric trader issue a GRS or GOTS transaction certificate without being certified themselves?
No. Any entity that buys and resells certified fabric must hold its own scope certificate under the relevant standard. An uncertified trader breaks the chain of custody, and their buyer cannot use the fabric in certified products.
How long is a transaction certificate valid?
A TC is valid for the specific transaction it covers. It does not expire in the traditional sense, but the scope certificate supporting it must remain active. If a supplier's scope certificate lapses, previously issued TCs may be challenged during audits.
What is the difference between a scope certificate and a transaction certificate?
A scope certificate confirms that a company is certified to operate under a standard (GRS or GOTS) for specific products and processes. A TC is a transaction-level document proving a specific shipment of certified material was sold in compliance with that standard.
Do GRS and GOTS certification requirements allow the same product to carry both labels?
Not typically. GRS covers recycled content; GOTS covers organic fiber. A product cannot simultaneously be recycled and organic in the same fiber component. However, a supplier can hold both certifications and offer separate product lines under each.
What happens if a brand receives fabric without a TC?
The brand cannot legally use the fabric in products marketed as GRS or GOTS certified. Using uncertified material in certified products is a standard violation that can result in certification suspension and reputational damage.
How does chain of custody certification work for forest-based textiles like viscose?
Standards such as the FSC apply chain of custody certification to forest-based materials, verifying that materials produced according to their standards can be tracked through the supply chain. As
FSC explains
, CoC certification "verifies that forest-based materials produced according to our rigorous standards are identified and tracked."
How often do GOTS-certified suppliers need to be audited?
GOTS requires annual on-site audits for all certified entities. This is one of the key differences between GOTS and GRS certification requirements, making GOTS compliance more operationally intensive.
About Sungil Tex
Sungil Tex is a Hong Kong-headquartered global textile and lining supplier specializing in sustainable and recycled fabrics for the fashion and apparel industry. Operating since 2008, the company holds GRS and GOTS certifications through Control Union and supplies over 200 global brands, including Burberry, Ralph Lauren, Calvin Klein, and Tommy Hilfiger, from offices across 13 countries. S
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