Digital Identity Architecture

Present an end-to-end design for a national digital identity ecosystem that preserves privacy, security, and user experience. Include authentication methods, privacy-preserving techniques (zero-knowledge proofs, selective disclosure), data governance policies, interoperability with public and private services, risk management, and consent architectures. Compare alternative governance models (centralized, federated, user-centric). Propose a roadmap for research, standards, and rollout that minimizes friction and maximizes trust.