Product authenticity & anti-counterfeiting
sealcha.in
One seal per bottle, one opening per seal.
A dual-layer cryptographic seal and verification platform anchored to Polygon and backed by sub-second AWS DynamoDB locks to prevent counterfeit goods, bootleg refilling, and tampering.
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Overview
sealcha.in combines public outer QR codes for pre-purchase authenticity verification with secret under-the-cap QR codes that irrevocably register first-opening events in milliseconds.
Built on WebCrypto ECDSA P-256 for instant offline verification in low-connectivity venues, hourly Merkle trees for zero-gas blockchain anchoring on Polygon Mainnet, and GS1 Digital Link compliance without requiring app downloads.
Core capabilities
Dual-layer seal architecture
Outer QR verifies authentic producer origin before purchase; hidden inner QR registers irreversible first-opening redemption.
100% Offline cryptographic verification
ECDSA P-256 producer signatures verified client-side using native browser WebCrypto without network dependency.
Sub-15ms atomic lock
AWS DynamoDB conditional writes eliminate race conditions and permanently record first opening timestamp and location.
Zero-gas Polygon Merkle anchoring
Hourly batching seals millions of individual bottle verifications into a single immutable Polygon smart contract transaction.
Zero app installation
Standard camera scanning opens a lightweight, GS1 Digital Link compliant PWA directly in mobile browsers.
Designed outcomes
Built to create practical value.
- Eliminates illegal refilling and bootleg alcohol risks
- Mathematical certainty and verifiable provenance for consumers
- Regulatory compliance with GS1 and EU Digital Product Passport (DPP / ESPR)
- Accessible verification directly in venues and retail without special hardware
