AFFIXIO
Zero knowledge
Zero knowledge privacy solutions for eligibility
Zero knowledge proof privacy lets verifiers learn allow or deny without receiving underlying attributes. AffixIO combines Noir ZK circuits with ML-DSA-65 signed outcomes and Merkle audit so eligibility gates are both private and independently verifiable. Issue, Bind, Present, Verify applies to age, membership, and agent policy predicates alike.
Definition
Zero knowledge eligibility proves a predicate holds while the verifier receives only signed allow or deny plus proof metadata, not source attributes.
Field note. ZK circuits with persisted inputs are not privacy-preserving. Verify the proof, not a copy of the underlying record.
Noir circuits at the eligibility boundary
AffixIO publishes Noir ZK circuits for common predicates. Issuers generate proofs upstream. Verifiers check signatures and circuit satisfaction. Return allow or deny. Zero PII at the verifier by default.
Combine with age assurance, wallet, and agent eligibility programmes without building separate privacy stacks per use case.
From sandbox to production gates
Start with yes or no circuits in the live sandbox. Map issuer systems of record. Wire verify into access middleware. Retain Merkle refs instead of attribute logs.
Compare stateless verification approaches when procurement asks why you are not standing up another identity database.
Operational detail for ZK eligibility solutions
For ZK eligibility solutions, provision sandbox circuits that mirror production predicates before you expose live agent traffic. Capture sample allow and deny payloads for regression tests.
Keep identity and rich attributes with the issuer. Verifiers receive outcomes and Merkle metadata only. Sync audit refs to your SIEM or order store after the gate returns.
Machine ID gap
Privacy washing without cryptographic verify
Teams label lookups private while still copying records into partner databases. True minimisation verifies outcomes, not documents.
Attribute export disguised as API design
Partners receive JSON bundles when they needed yes or no.
Non-reproducible privacy claims
Without signed proofs, auditors cannot re-check decisions.
ZK demos without production verify
Proof systems that never gate real authorisation paths.
Regulatory ambiguity
GDPR and sector rules favour data minimisation at the gate.
Chargeback record
ZK eligibility proofs without exposing source data
Zero-knowledge eligibility breaks down when teams still persist the inputs that fed the circuit. AffixIO issues ZK proofs at policy satisfaction; verify returns allow or deny only, with no source field retention.
Pick the predicate
Age, membership, licence status, agent scope.
Select or custom Noir circuit
Use catalogue circuits where possible.
Issue proofs upstream
Keep source attributes with issuers.
Verify at gates
Return signed allow or deny to relying parties.
Ops sign-off
Readiness checks for ZK eligibility solutions
- Confirm verifiers retain zero PII by default.
- Document predicate logic for auditors.
- Test deny when proofs expire.
- Store Merkle refs with access decisions.
- Review UK GDPR minimisation with legal counsel.
Integration FAQ
Questions on ZK eligibility solutions
AffixIO invent ZK?
AffixIO uses Noir ZK among published cryptographic components. See docs for circuit catalogue.
Replace all KYC?
No. Issuers perform regulated checks. AffixIO verifies outcomes downstream.
Performance at scale?
Verify latency depends on deployment. Test in sandbox with expected volumes.
Related compare guide?
/compare/stateless-verification explains the architecture.
Cross-links
Pages that support ZK eligibility solutions
Privacy and identity
More privacy and identity briefs
Prototype ZK eligibility solutions
Deploy Noir eligibility circuits in sandbox, then confirm verify paths retain no source documents.