Federated Proof

Federated Proof is the capability that enables cross-organisation receipt validation without requiring either party to share their underlying content. It allows organisations to prove that their answers were derived from genuine evidence, and for counterparties to verify those proofs, all without any confidential data leaving its owner's control.

The mechanism works through hash-only proof packs. When an organisation wants to share verifiable evidence of their CueCrux-generated answer with a partner, regulator, or counterparty, they construct a proof pack that contains the CROWN receipt with all hash commitments but with the actual evidence content stripped out. The proof pack includes the query, the receipt structure, the hash chain, and the cryptographic signature, but not the chunks of text that the hashes represent.

A receiving party that has their own copy of the same source material can verify the proof by recomputing the hashes from their own copies and comparing them against the commitments in the proof pack. If the hashes match, the recipient knows that the sender's answer was indeed derived from the claimed sources without the sender having had to reveal their specific evidence or the recipient having to trust the sender's assertions.

This approach is particularly valuable in regulated industries where data sovereignty and confidentiality are paramount. In financial services, two institutions engaged in a joint transaction might need to verify each other's due diligence findings without sharing their proprietary research. In pharmaceuticals, a company filing for regulatory approval might need to demonstrate that its conclusions are based on genuine clinical data without exposing the raw trial results to the regulator's IT systems. In legal practice, firms might need to verify the basis of a counterparty's claims without disclosing their own litigation strategy.

Federated Proof integrates with the Receipted Redaction system. Where Receipted Redaction handles the visual redaction of evidence in the Proof Surface, Federated Proof handles the structural construction of proof packs designed for cross-organisation exchange. Both systems share the same underlying cryptographic commitment framework.

Proof packs can be exchanged through standard file transfer mechanisms or through the CueCrux API. The verification process is documented in the SDK and can be performed programmatically, enabling automated verification workflows in environments where manual review would be impractical.

For the CueCrux platform, Federated Proof extends the platform's transparency guarantees beyond the boundaries of any single organisation. It creates a trust network where verified claims can flow between organisations while respecting data sovereignty, enabling collaborative verification in a world of competing confidentiality requirements.