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Data validation techniques for issuer authenticity include cryptographic signature checks (e.g., verifying a VC against an issuer’s public key), blockchain-based attestation (e.g., storing issuer keys on-chain), and certificate transparency logs. Decentralized Identifiers (DIDs) enable direct verification without intermediaries, while revocation registries (e.g., Merkle trees) ensure outdated credentials are flagged. Cross-referencing with government or industry databases adds another layer of trust for high-stakes use cases.

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