Zero Knowledge Data Checks
Counterparties confirm what they need without disclosing what they don’t. Selective attribute proof, not document handoff.
For institutions that need to verify counterparty attributes without taking on the data-handling burden of holding the underlying records.
Identity verification, treated as monolithic.
Identity and KYC data is treated as monolithic. A counterparty asks ‘verify this entity’, and what they receive is the full file: identity documents, beneficial ownership chains, risk scores, the lot. The data is then theirs to hold, audit, store and protect.
Two structural problems compound. Over-disclosure: counterparties ask for what's available, not what's required, because the request format gives them no other option. Data accumulation: every counterparty in a chain ends up holding the same underlying records, multiplying breach exposure and audit burden.
Institutions operating under GDPR data minimisation, or under any framework that limits the data a counterparty may hold, feel this most acutely. Over-disclosure is a structural cost of fragmented identity infrastructure, not a privacy-policy problem.
Yes / no. Nothing else crosses the network.
Selective attribute proof
Counterparties query specific attributes, such as jurisdiction, accreditation status, sanctions standing or age threshold, and receive yes/no answers. The underlying records do not cross the network.
Auditable verification chain
The proof itself is auditable. The originator and the consumer can confirm what was asked, when, by whom, and what was answered. The data minimisation is provable, not promised.
GDPR-aligned by construction
Data minimisation is not a policy applied after the fact, it is the default behaviour of the verification primitive. Counterparties cannot accumulate data they did not ask for, because the architecture does not deliver it.
Verification beyond financial services
The same yes/no proofs extend beyond regulated finance, into gambling, telecoms, healthcare and digital marketplaces, giving businesses bank-grade verification without ever holding the underlying data.
Self-contained within BlockID.
01 · Identity Compliance
BlockID
Know who you are dealing with.
02 · Transaction Compliance
BlockTravel
Clear every payment before it moves.
Zero Knowledge Data Checks operate entirely within BlockID. The verification work happens against records the originating institution already holds: only the answer crosses the network. No transaction is required and no movement obligation applies. The check is a self-contained query against verified state.
Inherited from BlockID.
- FCA
- MiCA
- FATF
- GDPR
- MAS
- OpenAPI 3.0
- OAuth2
- mTLS
Zero Knowledge Data Checks inherit the regulatory and technical standards of BlockID. GDPR data minimisation is not just a framework we operate under. It is the principle the use case is built to satisfy.
One product. One commitment.
Verify what matters. Disclose nothing else.
Design partners get early access to the Zero Knowledge Data Checks capability of BlockID, a direct line to the build team, and influence over the attribute schema and proof formats. We ask for genuine integration intent, a structured feedback loop with named compliance and technical counterparts, and a mutual non-disclosure agreement.