Solo is a zkHE-based identity protocol designed for anonymous yet verifiable authentication in Web3. It balances privacy, identity uniqueness, and decentralized verification by using homomorphic encryption, Pedersen commitments, and Groth16 zk-SNARKs. Biometric data is encrypted and processed locally, while only zero-knowledge proofs are published on-chain without exposing sensitive information. The protocol operates on its own Layer-2 solution (SoloChain), supporting identity verification for DeFi, gaming, and Sybil-resistant applications.