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Identity networks authenticate vintage wine provenance using blockchain-anchored verifiable credentials (VCs). Each bottle receives a DID with metadata (e.g., vineyard, harvest year), stored on a permissioned ledger. Experts issue VCs attesting to authenticity, which smart contracts cross-check against historical records (e.g., winery logs). NFC tags or QR codes link physical bottles to digital VCs, enabling real-time verification. Zero-knowledge proofs let buyers confirm legitimacy without revealing proprietary data (e.g., producer identities).

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