Zero-Knowledge Proofs for Document Privacy

Zero-knowledge proofs represent one of the most exciting developments in cryptography. In this post, we explore how ZK technology could enhance document privacy on Cornicular.

The Privacy Challenge

Today, Cornicular stores only document hashes on-chain, which already provides strong privacy guarantees. However, there are scenarios where users need to prove specific attributes about a document without revealing the document itself.

For example, a university might want to verify that a degree certificate is authentic without seeing the grades. A company might want to confirm that a contract was registered without reading its terms.

Zero-Knowledge Proofs Explained

Zero-knowledge proofs allow one party to prove to another that a statement is true without revealing any information beyond the validity of the statement itself. In the context of document verification, this means proving properties about a document without exposing its content.

Our Approach

We are researching zk-SNARK circuits that can prove document properties against on-chain hashes. The circuit would take a document and a set of attributes as private inputs, and produce a proof that the attributes are consistent with the registered hash.

This technology is still in the research phase, but we believe it will unlock entirely new use cases for privacy-preserving document verification in the coming years.