An unbroken chain of trust, from factory floor to smartphone.
Combining GS1 DPP, C2PA, and Hedera Hashgraph creates a powerful trifecta for supply chain transparency. It bridges commercial interoperability (GS1), data accountability (C2PA), and immutable timeline proof (Hedera). Rather than isolated systems, they snap together linearly, forming a single chain of trust.
Who does what?
Think of the stack as a highly secure digital passport for a garment. Three standards, three distinct responsibilities.
Standardized identity and web address. The same GTIN scanned at retail checkouts globally.
Cryptographic proof of who wrote the data and what it says, signed with the brand's private key.
A decentralized, unhackable clock proving when each claim was recorded.
One garment, three standards, three steps.
Here is how the three technologies interact across a product's lifecycle, using a FILA Settanta Track Jacket as a real-world example.
- 01Powered by GS1The Physical Scan
A consumer taps an embedded NFC chip or scans a QR code on the jacket's label. The code is encoded as a GS1 Digital Link URL:
https://id.evidence3.com/01/07333065000018/21/EV3-7F3A-9B21The URL natively embeds the GS1 SGTIN (Global Trade Item Number + Serial Number), so the garment uses the exact same identification standard scanned at retail checkouts worldwide.
- 02Powered by C2PAOpening the Passport
The Digital Link resolves to the EV3 Consumer Passport. In the background, the application pulls up the product's C2PA Manifest, containing assertions about the jacket: 100% recycled rPET material, 8.4 kg CO₂e carbon footprint, living-wage factory certifications.
Because it uses C2PA, this file is cryptographically signed by the brand's private key (O=FILA Europe S.r.l.). If a hacker alters the carbon data on the hosting server, the browser's validation engine throws an immediate red flag, the file's hash signature breaks.
- 03Powered by HederaVerifying the Timeline
To ensure the brand didn't fabricate this history yesterday, the application cross-references the C2PA manifest with a public ledger entry on Hedera Hashgraph. The unique hash of the manifest is submitted to the Hedera Consensus Service (HCS), which returns a public, decentralized timestamp.
As the jacket moves through its life, sold at retail, resold on Vestiaire Collective, repaired at The Restory, each transition is pushed to Hedera, building a chronological, unchangeable audit trail that fulfills EU lifecycle API requirements.
The unified data model.
Under the hood, the integration looks like a nested structure where all three standards live together.
{
"gs1_identity": {
"gtin": "07333065000018",
"serial": "EV3-7F3A-9B21-1C4D",
"digital_link": "https://id.evidence3.com/gtin/07333065000018/ser/EV3-7F3A-9B21"
},
"c2pa_manifest": {
"spec_version": "2.1",
"claim_generator": "ev3-stamp/2.4.1",
"signature": "CN=fila-stamp-signer.eu, O=FILA Europe S.r.l.",
"assertions": {
"materials": "94% mono-material recycled polyester",
"carbon_footprint": "8.4 kg CO2e"
}
},
"hedera_anchor": {
"topic_id": "0.0.4419821",
"consensus_timestamp": "2025-03-14T09:21:46.000Z",
"transaction_hash": "0x9f3c…b21a"
}
}Value beyond compliance.
By combining these three elements, EV3 Stamp achieves what the GS1 Sweden handbook calls "value beyond compliance." Brands don't have to alter their existing GS1 inventory systems, regulators get airtight cryptographic validation (C2PA) that helps eliminate greenwashing, and the circular economy gets an immutable ledger (Hedera) to track a garment's true lifecycle.