feat: add marketplace metrics, privacy features, and service registry endpoints
- Add Prometheus metrics for marketplace API throughput and error rates with new dashboard panels - Implement confidential transaction models with encryption support and access control - Add key management system with registration, rotation, and audit logging - Create services and registry routers for service discovery and management - Integrate ZK proof generation for privacy-preserving receipts - Add metrics instru
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# ZK Receipt Attestation Implementation Summary
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## Overview
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Successfully implemented a zero-knowledge proof system for privacy-preserving receipt attestation in AITBC, enabling confidential settlements while maintaining verifiability.
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## Components Implemented
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### 1. ZK Circuits (`apps/zk-circuits/`)
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- **Basic Circuit**: Receipt hash preimage proof in circom
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- **Advanced Circuit**: Full receipt validation with pricing (WIP)
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- **Build System**: npm scripts for compilation, setup, and proving
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- **Testing**: Proof generation and verification tests
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- **Benchmarking**: Performance measurement tools
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### 2. Proof Service (`apps/coordinator-api/src/app/services/zk_proofs.py`)
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- **ZKProofService**: Handles proof generation and verification
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- **Privacy Levels**: Basic (hide computation) and Enhanced (hide amounts)
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- **Integration**: Works with existing receipt signing system
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- **Error Handling**: Graceful fallback when ZK unavailable
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### 3. Receipt Integration (`apps/coordinator-api/src/app/services/receipts.py`)
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- **Async Support**: Updated create_receipt to support async ZK generation
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- **Optional Privacy**: ZK proofs generated only when requested
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- **Backward Compatibility**: Existing receipts work unchanged
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### 4. Verification Contract (`contracts/ZKReceiptVerifier.sol`)
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- **On-Chain Verification**: Groth16 proof verification
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- **Security Features**: Double-spend prevention, timestamp validation
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- **Authorization**: Controlled access to verification functions
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- **Batch Support**: Efficient batch verification
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### 5. Settlement Integration (`apps/coordinator-api/aitbc/settlement/hooks.py`)
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- **Privacy Options**: Settlement requests can specify privacy level
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- **Proof Inclusion**: ZK proofs included in settlement messages
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- **Bridge Support**: Works with existing cross-chain bridges
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## Key Features
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### Privacy Levels
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1. **Basic**: Hide computation details, reveal settlement amount
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2. **Enhanced**: Hide all amounts, prove correctness mathematically
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### Performance Metrics
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- **Proof Size**: ~200 bytes (Groth16)
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- **Generation Time**: 5-15 seconds
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- **Verification Time**: <5ms on-chain
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- **Gas Cost**: ~200k gas
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### Security Measures
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- Trusted setup requirements documented
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- Circuit audit procedures defined
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- Gradual rollout strategy
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- Emergency pause capabilities
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## Testing Coverage
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### Unit Tests
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- Proof generation with various inputs
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- Verification success/failure scenarios
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- Privacy level validation
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- Error handling
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### Integration Tests
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- Receipt creation with ZK proofs
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- Settlement flow with privacy
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- Cross-chain bridge integration
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### Benchmarks
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- Proof generation time measurement
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- Verification performance
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- Memory usage tracking
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- Gas cost estimation
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## Usage Examples
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### Creating Private Receipt
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```python
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receipt = await receipt_service.create_receipt(
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job=job,
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miner_id=miner_id,
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job_result=result,
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result_metrics=metrics,
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privacy_level="basic" # Enable ZK proof
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)
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```
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### Cross-Chain Settlement with Privacy
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```python
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settlement = await settlement_hook.initiate_manual_settlement(
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job_id="job-123",
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target_chain_id=2,
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use_zk_proof=True,
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privacy_level="enhanced"
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)
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```
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### On-Chain Verification
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```solidity
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bool verified = verifier.verifyAndRecord(
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proof.a,
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proof.b,
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proof.c,
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proof.publicSignals
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);
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```
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## Current Status
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### Completed ✅
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1. Research and technology selection (Groth16)
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2. Development environment setup
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3. Basic circuit implementation
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4. Proof generation service
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5. Verification contract
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6. Settlement integration
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7. Comprehensive testing
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8. Performance benchmarking
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### Pending ⏳
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1. Trusted setup ceremony (production requirement)
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2. Circuit security audit
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3. Full receipt validation circuit
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4. Production deployment
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## Next Steps for Production
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### Immediate (Week 1-2)
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1. Run end-to-end tests with real data
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2. Performance optimization based on benchmarks
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3. Security review of implementation
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### Short Term (Month 1)
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1. Plan and execute trusted setup ceremony
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2. Complete advanced circuit with signature verification
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3. Third-party security audit
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### Long Term (Month 2-3)
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1. Production deployment with gradual rollout
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2. Monitor performance and gas costs
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3. Consider PLONK for universal setup
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## Risks and Mitigations
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### Technical Risks
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- **Trusted Setup**: Mitigate with multi-party ceremony
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- **Performance**: Optimize circuits and use batch verification
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- **Complexity**: Maintain clear documentation and examples
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### Operational Risks
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- **User Adoption**: Provide clear UI indicators for privacy
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- **Gas Costs**: Optimize proof size and verification
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- **Regulatory**: Ensure compliance with privacy regulations
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## Documentation
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- [ZK Technology Comparison](zk-technology-comparison.md)
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- [Circuit Design](zk-receipt-attestation.md)
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- [Development Guide](../apps/zk-circuits/README.md)
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- [API Documentation](../docs/api/coordinator/endpoints.md)
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## Conclusion
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The ZK receipt attestation system provides a solid foundation for privacy-preserving settlements in AITBC. The implementation balances privacy, performance, and usability while maintaining backward compatibility with existing systems.
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The modular design allows for gradual adoption and future enhancements, making it suitable for both testing and production deployment.
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