[FRONTEND]: Zero-knowledge proof endpoints missing in ZHTP node

[umwelt]

Problem

The API client expects ZK proof generation and verification endpoints that don't exist in the ZHTP node.

Missing Endpoints (HIGH PRIORITY)

1. POST /api/v1/zkp/generate - Generate zero-knowledge proof
2. POST /api/v1/zkp/verify - Verify zero-knowledge proof

Current Node Implementation

• NONE - ZK proof subsystem missing from API

Impact

• HIGH PRIORITY - ZK privacy features not functional
• Identity verification without revealing data not working
• Privacy-preserving transactions unavailable
• Core to privacy model

Expected Behavior

POST /api/v1/zkp/generate

• Request: { data: any } - Data to prove knowledge of
• Response: Proof object with zk_proof data
• Should generate bulletproof or similar ZK proof

POST /api/v1/zkp/verify

• Request: Proof object
• Response: { valid: boolean }
• Should verify proof without revealing underlying data

Implementation Location

ZHTP Node: New handler needed - zhtp/src/api/handlers/zkp/mod.rs
Libraries: lib-proofs already has ZK implementation

Notes

• lib-proofs already implements bulletproofs
• Need to expose via HTTP API
• Critical for privacy-preserving features

Priority

HIGH - Important privacy feature for alpha

[umwelt]

Closing as IMPLEMENTED in PR #107.

Zero-knowledge proof endpoints implemented:

• POST /api/v1/zkp/generate - Generate ZK proofs
• POST /api/v1/zkp/verify - Verify ZK proofs

Supported proof types:

• age_over_18 - Prove age ≥ 18
• age_range - Prove age in range
• citizenship_verified - Prove citizenship
• jurisdiction_membership - Prove jurisdiction

Implementation: zhtp/src/api/handlers/zkp.rs
Security features: authentication, rate limiting, proof expiration
Merged in: SOVEREIGN-NET/The-Sovereign-Network#107