```

chore: refactor logging module, update genesis timestamp, remove model relationships, and reorganize routers

- Rename logging.py to logger.py and update import paths in poa.py and main.py
- Update devnet genesis timestamp to 1766828620
- Remove SQLModel Relationship declarations from Block, Transaction, and Receipt models
- Add SessionDep type alias and get_session dependency in coordinator-api deps
- Reorganize coordinator-api routers: replace explorer/registry with exchange, users, marketplace

docs/done.md

@@ -13,7 +13,8 @@ This document tracks components that have been successfully deployed and are ope
   - Full-featured blockchain explorer
   - Mock data with genesis block (height 0) displayed
   - Blocks, transactions, addresses, receipts tracking
-  - Mock/live data toggle functionality
+  - Mock/live data toggle functionality (live mode backed by Coordinator API)
+  - Live API (nginx): `/api/explorer/*`
 
 - ✅ **Marketplace Web** - Deployed at https://aitbc.bubuit.net/marketplace/
   - Vite + TypeScript frontend
@@ -21,10 +22,12 @@ This document tracks components that have been successfully deployed and are ope
   - Mock data fixtures with API abstraction
 
 - ✅ **Coordinator API** - Deployed in container
-  - Minimal FastAPI service running on port 8000
-  - Health endpoint: /v1/health returns {"status":"ok","env":"container"}
-  - nginx proxy: /api/v1/ routes to container service
-  - Note: Full codebase has import issues, minimal version deployed
+  - FastAPI service running on port 8000
+  - Health endpoint: `/api/v1/health` returns `{"status":"ok","env":"dev"}`
+  - nginx proxy: `/api/` routes to container service (so `/api/v1/*` works)
+  - Explorer API (nginx): `/api/explorer/*` → backend `/v1/explorer/*`
+  - Users API: `/api/v1/users/*` (compat: `/api/users/*` for Exchange)
+  - ZK Applications API: /api/zk/ endpoints for privacy-preserving features
 
 - ✅ **Wallet Daemon** - Deployed in container
   - FastAPI service with encrypted keystore (Argon2id + XChaCha20-Poly1305)
@@ -38,6 +41,27 @@ This document tracks components that have been successfully deployed and are ope
   - Miner, client, developer guides
   - API references and technical specs
 
+- ✅ **Trade Exchange** - Deployed at https://aitbc.bubuit.net/Exchange/
+  - Bitcoin wallet integration for AITBC purchases
+  - User management system with individual wallets
+  - QR code generation for payments
+  - Real-time payment monitoring
+  - Session-based authentication
+  - Exchange rate: 1 BTC = 100,000 AITBC
+
+- ✅ **ZK Applications** - Privacy-preserving features deployed
+  - Circom compiler v2.2.3 installed
+  - ZK circuits compiled (receipt_simple with 300 constraints)
+  - Trusted setup ceremony completed (Powers of Tau)
+  - Available features:
+    - Identity commitments
+    - Stealth addresses
+    - Private receipt attestation
+    - Group membership proofs
+    - Private bidding
+    - Computation proofs
+  - API endpoints: /api/zk/
+
 ## Host Services (GPU Access)
 
 - ✅ **Blockchain Node** - Running on host
@@ -56,7 +80,11 @@ This document tracks components that have been successfully deployed and are ope
 - ✅ **nginx Configuration** - All routes configured
   - /explorer/ → Explorer Web
   - /marketplace/ → Marketplace Web  
+  - /api/ → Coordinator API (container)
   - /api/v1/ → Coordinator API (container)
+  - /api/explorer/ → Explorer API (container)
+  - /api/users/ → Users API (container, Exchange compatibility)
+  - /api/zk/ → ZK Applications API (container)
   - /rpc/ → Blockchain RPC (host)
   - /v1/ → Mock Coordinator (host)
   - /wallet/ → Wallet Daemon (container)
@@ -73,7 +101,7 @@ This document tracks components that have been successfully deployed and are ope
 ## Deployment Architecture
 
 - **Container Services**: Public web access, no GPU required
-  - Website, Explorer, Marketplace, Coordinator API, Wallet Daemon, Docs
+  - Website, Explorer, Marketplace, Coordinator API, Wallet Daemon, Docs, ZK Apps
 - **Host Services**: GPU access required, private network
   - Blockchain Node, Mining operations
 - **nginx Proxy**: Routes requests between container and host
@@ -82,11 +110,13 @@ This document tracks components that have been successfully deployed and are ope
 ## Current Status
 
 **Production Ready**: All core services deployed and operational
-- ✅ 6 container services running
+- ✅ 8 container services running (including ZK Applications)
 - ✅ 1 host service running  
 - ✅ Complete nginx proxy configuration
 - ✅ SSL/HTTPS fully configured
 - ✅ DNS resolution working
+- ✅ Trade Exchange with Bitcoin integration
+- ✅ Zero-Knowledge proof capabilities enabled
 
 ## Remaining Tasks