GuardZeroPrivate health credentials on Stellar

Issue tamper-proof vaccination credentials and prove status with zero-knowledge proofs, with no names, birthdates or medical history exposed.

Soroban contracts

Identity registry, vaccination verification, access control and data sharing, with a timelocked upgrade path.

Circom circuits and Groth16 proofs let holders prove vaccination status without revealing the underlying record.

One package for the backend REST API and the on-chain contracts.