How Textile Suppliers Prove Chain of Custody: A Deep Dive into Transaction Certificate Workflows for GRS, GOTS, and BCI Certified Fabric Orders
Updated: Jul 28
When a fashion brand claims its jacket lining is made from recycled polyester, that claim is only as credible as the paperwork behind it. Chain of custody certification is the formal, audited process that tracks certified materials from raw fiber through every production stage to the finished product, ensuring that sustainability claims on a label are verifiable and not just marketing. For buyers sourcing GRS, GOTS, or BCI certified fabrics, understanding how transaction certificate (TC) workflows actually operate is the difference between genuine compliance and greenwashing exposure.
TL;DR
Chain of custody certification verifies that certified material claims are accurate at every handoff in the supply chain.
Each certified sale requires a transaction certificate (TC) issued by an accredited body, linking buyer and seller to a specific certified shipment.
GRS, GOTS, and BCI each have distinct TC requirements, scope definitions, and verification triggers.
Supply chain transparency in fashion is increasingly a legal requirement, not just a brand differentiator.
Choosing a supplier that holds multiple certifications and maintains ready documentation dramatically reduces compliance risk for buyers.
About the Author:
This article is written by the team at
Sungil Tex
, a Hong Kong-headquartered sustainable textile supplier operating since 2008. Holding active GRS, GOTS, and BCI certifications and supplying over 200 global fashion brands, Sungil Tex brings direct, operational experience to every aspect of certified fabric sourcing and transaction certificate compliance.
What Is Chain of Custody Certification in Textiles?
Chain of custody (CoC) is the documented, verified record of how a material changes hands from one certified entity to the next. According to Textile Exchange, chain of custody ensures that claims about fiber content in a final product, such as "organically grown" or "recycled," are accurate throughout every stage of their journey.
In practical terms, this means every factory, mill, and supplier in the chain must hold their own certification and issue or receive a transaction certificate each time certified goods are sold. A single gap in that chain invalidates the claim for everything downstream.
"Chain of custody is not a single document. It is a continuous, audited handshake between every certified party in the supply chain."
As noted by Ellie Connect, chain of custody specifically tracks the change in legal ownership of a product as it moves along the supply chain, which is distinct from physical traceability (knowing where something was made) or transparency (disclosing that information publicly).
How Does a Transaction Certificate Workflow Actually Work?
A transaction certificate (TC) is a document issued by a certification body that confirms a specific shipment of goods was produced from certified materials by a certified supplier. It is not a general company credential but a shipment-specific proof of compliance.
Step-by-step TC workflow for a certified fabric order:
Buyer places a certified order. The buyer specifies which standard applies (GRS, GOTS, BCI) and requests a TC as part of the purchase terms.
Supplier confirms scope certification. The supplier must hold a valid scope certificate under the relevant standard before any TC can be issued.
Production is completed and documented. Input materials, batch numbers, and processing records are compiled and submitted to the certification body.
Certification body reviews and issues TC. After verifying that inputs were certified and the production process complied with the standard, the body issues the TC referencing the specific shipment.
TC is shared with buyer. The buyer receives the TC, which they must retain to substantiate their own downstream claims or certifications.
Buyer's own certification body is notified. If the buyer is also certified, their certification body may require the TC to be uploaded to a shared platform (such as Textile Exchange's TrackIt system).
According to Tracex, the core steps of any robust chain of custody process include source identification, supplier verification, batch segregation, and formal custody transfer records. These same principles apply directly to textile TC workflows.
What Are the GRS Certification Requirements for Transaction Certificates?
The Global Recycled Standard (GRS) governs recycled polyester certification and other recycled material claims. A GRS transaction certificate is required for every sale of GRS-certified product between certified entities.
Requirement | GRS | GOTS | BCI |
TC required per shipment? | Yes | Yes | No (claim-based, volume tracked) |
Minimum recycled content for label claim | 20% (50% for GRS label) | N/A (organic fiber focus) | N/A (Better Cotton sourcing claim) |
Third-party audit required? | Yes | Yes | Yes (at farm level) |
Buyer must also be certified? | Yes, to make on-product claims | Yes | No (retailer membership model) |
Platform for TC tracking | Control Union / Textile Exchange TrackIt | GOTS DB | BCI member portal (volume credits) |
GRS certification requirements are particularly rigorous for recycled polyester certification because the standard must verify not just that a material is recycled, but that it originated from a legitimate pre- or post-consumer waste stream. This is where many suppliers fall short: holding a scope certificate is not sufficient if the input material itself lacks traceable documentation.
As Vogue Business reported, Textile Exchange's TrackIt system electronically tracks the chain of custody of certified materials, and regulators are increasingly referencing these digital records as part of supply chain reporting rules.
Why Is BCI Different from GRS and GOTS in Chain of Custody Terms?
BCI (Better Cotton Initiative) operates on a mass balance model rather than a physical segregation model. This is a critical distinction that confuses many buyers.
Physical segregation (GRS/GOTS): The actual certified fiber is tracked and kept separate throughout the supply chain. The TC references that specific material.
Mass balance (BCI): Better Cotton is sourced and credited to the system, but the physical cotton in a buyer's product may not be the specific Better Cotton bale. Volume is tracked and credited across the system.
This means BCI does not require a TC per shipment. Instead, brands purchase Better Cotton credits proportional to their cotton sourcing volume.
For buyers, this simplifies procurement but also limits the granularity of chain of custody documentation available for audit purposes.
Understanding this distinction matters when brands face regulatory scrutiny. A GRS transaction certificate provides shipment-level proof. A BCI membership record provides system-level proof. Neither is inherently superior, but they serve different compliance purposes.
What Are the Biggest Chain of Custody Failures in Fashion Supply Chains?
Research published in the Scientific Research Publishing journal found that transparency and traceability directly impact sustainability outcomes in fashion supply chains, yet implementation gaps remain widespread. The most common chain of custody failures include:
Scope certificate lapses: A supplier's certification expires mid-season, invalidating TCs issued during the lapsed period.
Subcontractor gaps: A certified mill subcontracts a processing step to an uncertified facility, breaking the chain without the buyer's knowledge.
Input material mismatches: The certified fiber percentage claimed on a TC does not match the actual input records on file with the certification body.
TC delays causing shipment holds: Buyers receive goods before TCs are issued, creating compliance documentation gaps.
A case study on ASKET, highlighted by FASH455, illustrates that the apparel supply chain is far more complex than the commonly understood four stages of fiber, yarn, fabric, and garment manufacturing. Each additional processing step is a potential break in the chain of custody.
As Lectra notes, the solution is a digital chain of custody that empowers certification bodies to engage at every stage of the supply chain, rather than relying on paper-based records that can be lost or manipulated.
How Should Buyers Verify a Supplier's Chain of Custody Certification?
Verification is not simply a matter of asking for a certificate. Here is a practical checklist for buyers:
Confirm the supplier's scope certificate is current and covers the specific product category you are ordering.
Cross-reference the certificate number against the certification body's public database (e.g., Textile Exchange's certified company search).
Request a sample TC from a previous order to verify formatting and certification body details before placing your order.
Confirm that your own company holds the required certification to receive and use the TC for on-product claims.
Ask the supplier to identify all subcontractors involved in your order and confirm each holds relevant certification.
Sungil Tex holds active Control Union certifications for both GRS (License CU 1022128) and GOTS (License CU 1022128), as well as BCI membership (Member ID 1009257). These credentials are maintained continuously across its supply chain operations in Korea, China, and Vietnam, meaning buyers can request TCs for certified fabric orders without disruption to lead times.
Frequently Asked Questions
Q: Can a supplier issue its own transaction certificate?
No. A TC must be issued by an accredited third-party certification body, not the supplier itself. The supplier applies for the TC and provides supporting production records, but the certification body issues and signs the document.
Q: Does chain of custody certification guarantee the product is sustainable?
It verifies that the certified material claim is accurate. It does not automatically certify all environmental or social attributes of the product. GRS certifies recycled content; GOTS certifies organic fiber and processing; BCI certifies responsible cotton farming practices.
Q: How long does it take to receive a GRS transaction certificate after shipment?
Timelines vary by certification body, but typically range from 5 to 15 business days after the supplier submits production documentation. Buyers should build this into their compliance timelines, not treat it as an afterthought post-shipment.
Q: Is supply chain transparency in fashion now legally required?
Increasingly, yes. Regulations such as the EU's Corporate Sustainability Due Diligence Directive and the EUDR create legal obligations around supply chain documentation that overlap directly with chain of custody requirements. Non-compliance carries reputational and financial risk.
Q: What is the difference between a scope certificate and a transaction certificate?
A scope certificate certifies that a company is approved to handle and sell certified products under a given standard. A transaction certificate certifies that a specific shipment was produced from certified inputs by that certified company. You need both to complete a compliant sale.
Q: Do minimum order quantities affect TC eligibility?
No. TC eligibility is based on certification status and input documentation, not order size. However, suppliers with no minimum order quantity requirements make it easier for smaller brands to access certified materials without overordering to meet volume thresholds.
About Sungil Tex
Sungil Tex is a Hong Kong-headquartered global textile and lining supplier operating since 2008, recognized as Asia's leading sustainable lining company. The company holds active GRS, GOTS, and BCI certifications and supplies over 200 global fashion brands, including Burberry, Ralph Lauren, Calvin Klein, and Hugo Boss, from its integrated supply chain network spanning 13 countries. With over 50 types of sustainable textiles, including recycled polyester, recycled nylon, BCI cotton, and biodegradable viscose, Sungil Tex provides buyers with full certification documentation and transaction certificate support as a standard part of every certified order. Uniquely, the company prices its sustainable materials competitively against conventional alternatives, removing the cost barrier that has historically slowed sustainable sourcing adoption.
Ready to source certified fabrics with full chain of custody documentation?
Sungil Tex makes GRS, GOTS, and BCI certified ordering straightforward, with active certifications, fast lead times, and no minimum order quantities on running stock.
References
Textile Exchange. Chain of Custody. https://textileexchange.org/chain-of-custody/
FASH455 Global Apparel & Textile Trade and Sourcing. Progress and Challenges in Apparel Supply Chain Traceability: A Case Study on ASKET. https://shenglufashion.com/2023/06/05/progress-and-challenges-in-apparel-supply-chain-traceability-a-case-study-on-asket/
Scientific Research Publishing. Impacts of Transparency and Traceability on Fashion Supply Chain System. https://www.scirp.org/journal/paperinformation?paperid=124301
Vogue Business. Confused by supply chain reporting rules? You're not the only one. https://www.vogue.com/article/confused-by-supply-chain-reporting-rules-youre-not-the-only-one
Tracex. Chain of Custody in EUDR Compliance - Step by Step Guide. https://tracextech.com/chain-of-custody-in-eudr-compliance/
Ellie Connect. Understanding traceability in the textiles & fashion industry. https://ellieconnect.com/ep3/
Lectra. Mastering supply chain transparency: How to tackle three main traceability challenges. https://www.lectra.com/en/library/mastering-supply-chain-transparency-how-to-tackle-three-main-traceability-challenges
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