Confidential Contracts, Public Proof
Verify authenticity while preserving privacy.
The Privacy Paradox
Documents that must be verified often cannot be shared. Medical records prove treatment history but contain protected health information. Financial statements demonstrate creditworthiness but reveal proprietary business data. Employment records verify background but include compensation details. The requirement for verification collides with the requirement for privacy.
Traditional verification exposes content unnecessarily. To prove you have valid insurance, you share the entire policy document. To prove you passed a background check, you share the full report. To prove you own a property, you share the deed with legal descriptions and transaction history. Each verification request becomes a data leak—content exposure far exceeding what the verifier actually needs to know.
Regulatory frameworks demand this tension be resolved. GDPR requires data minimization—sharing only what's necessary. HIPAA restricts health information disclosure. Financial privacy regulations limit who can see what. Yet verification requirements remain. The infrastructure that should enable privacy-preserving verification instead forces a choice between privacy and proof.
The solution architecture has been possible but not practical. Zero-knowledge proofs can mathematically verify facts without revealing data. Cryptographic hashes can prove existence without exposing content. But implementing these technologies for everyday document verification has required deep cryptographic expertise. The promise of private proof remained theoretical while practical verification continued to leak data.
How Integra Solves It
Stop worrying about document fraud. We've got you covered.
Hash on Chain, Document Off-Chain
Register documents with integraHashes that prove existence and authenticity without storing content on blockchain. The document remains in your private systems—your servers, your encryption, your access controls. The blockchain stores only the cryptographic fingerprint. Verifiers confirm authenticity by comparing hashes. Content never leaves your environment. Privacy is preserved by architecture, not policy.
Selective Disclosure
Reveal only the fields a verifier needs while proving the rest exists unchanged. An insurance certificate can expose coverage limits while hiding policy numbers. A diploma can reveal degree and date while concealing grades. A contract can show signatories while protecting commercial terms. Each verification request receives exactly the disclosure it requires—nothing more.
Zero-Knowledge Attestations
Prove facts about documents without revealing any content. Prove someone is over 18 without revealing their birthdate. Prove income exceeds a threshold without disclosing the exact amount. Prove certification is current without showing the certification details. EAS attestations provide cryptographic statements that verifiers can trust while document content remains completely private.
Privacy-Preserving Verification
Verification flow designed for privacy from first principles. Verifier requests confirmation of a fact. Document holder's system computes the proof. Proof is transmitted without document content. Verifier confirms the cryptographic proof. At no point does document content leave the holder's control. The verifier receives certainty without exposure. Privacy and verification coexist.
Use Cases
Medical Records
Prove treatment history without exposing diagnoses. Verify vaccination status without revealing medical records. Confirm prescription validity without sharing health information. Healthcare providers verify coverage without accessing patient files. HIPAA compliance is maintained by architecture. Patient privacy is preserved while necessary verifications proceed.
Financial Documents
Prove income level without disclosing exact figures. Verify credit approval without sharing scores. Confirm account balances exceed thresholds without revealing balances. Loan applications receive verification without full financial exposure. Tax returns are verifiable without public disclosure. Financial privacy is maintained while lending decisions proceed.
Employment Records
Verify employment history without exposing compensation. Confirm background check passage without sharing report details. Prove tenure length without revealing personnel file. Reference checks receive verification without HR document access. Salary history remains private while qualifications are confirmed.
Identity Documents
Prove age without revealing birthdate. Verify citizenship without exposing passport numbers. Confirm residency without sharing address details. Identity verification proceeds without creating identity theft risk. KYC requirements are satisfied with minimal data exposure. Identity privacy is maintained while regulatory obligations are met.
Contracts and Agreements
Prove contract existence without revealing terms. Verify signature without exposing content. Confirm agreement date without sharing details. M&A due diligence receives confirmation without competitor exposure. Confidential agreements remain confidential while their existence is verifiable.
Compliance Certifications
Verify audit passage without sharing audit details. Confirm certification currency without exposing assessment results. Prove compliance status without regulatory document disclosure. Counterparties receive assurance without accessing internal compliance documentation. Competitive information remains protected while compliance is verified.
Privacy Technology
Integra's privacy architecture implements cryptographic best practices to deliver private proof at enterprise scale.
Cryptographic Hashing: Document content is hashed using SHA-256, producing a deterministic fingerprint that cannot be reversed to reveal content. The hash proves exact content existed at registration time. Any content change—even a single bit—produces an entirely different hash. Verification is binary and instant: either the hash matches or it doesn't.
Zero-Knowledge Proofs: For fact verification without content exposure, Integra implements zero-knowledge proof circuits. A proof is generated that mathematically demonstrates a statement is true (e.g., "this person is over 18") without revealing the underlying data (the birthdate). The verifier can confirm the proof's validity without learning anything beyond the verified statement.
Selective Disclosure: Documents can be structured with field-level hashing, enabling revelation of specific fields while proving the unrevealed fields exist unchanged. An insurance certificate might reveal the coverage amount while the hashed policy number remains private. The revealed field is verifiable against the registered document, while unrevealed fields remain cryptographically sealed.
Attestation Layer: The Ethereum Attestation Service provides a standard for cryptographic attestations about documents. An authorized attestor (employer, issuing authority, verified party) creates an on-chain attestation that proves a fact about a document. The attestation is verifiable without the document. Multiple attestations can be combined for complex verification requirements.
Access Controls: Document holders control who receives verification. Each verification request can require holder approval. Audit logs track all verification attempts and grants. Holders can revoke access to attestations. Privacy is not just architectural—it's controllable. Document holders maintain sovereignty over their information.
Benefits
Stop worrying about document fraud. We've got you covered.
Absolute Content Protection
Document content never leaves your control during verification. No "view once" that could be screenshotted. No encrypted sharing that could be decrypted. The content simply never transmits. What verifiers receive is mathematical proof, not content. The strongest privacy is content that never leaves—and Integra's architecture ensures it doesn't.
Cryptographic Certainty
Verification isn't trust-based—it's mathematical. Verifiers receive proofs that are computationally impossible to fake. The certainty of verification equals the certainty of cryptography. No probabilistic assessments. No reliance on reputation. The proof is either valid or it isn't. Mathematics replaces trust.
Regulatory Compliance Built In
Privacy by design satisfies GDPR data minimization. Content protection meets HIPAA requirements. Access controls support CCPA rights. The architecture implements regulatory requirements rather than requiring policy overlays. Compliance officers can demonstrate the technical controls that enforce privacy obligations.
Holder Sovereignty
Document holders control their information. Every verification requires holder participation—active or pre-authorized. Audit logs provide visibility into who verified what. Access can be revoked. Privacy isn't delegated to platforms—it's retained by holders. Your documents, your control, your choice about what to verify and with whom.
Frequently Asked Questions
Verify Without Exposing
See how Integra enables cryptographic proof of document authenticity while keeping content completely private. Schedule a demo to explore private proof for your most sensitive documents—medical records, financial statements, confidential agreements.