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fix::> init confidential escrow
Signed-off-by: Abhinav Prakash <abhinav.prakash319@gmail.com>
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‎samples/chaincode/confidential-escrow/.gitignore‎

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ecc
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ecc-bundle
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enclave.json
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private.pem
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public.pem
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mrenclave
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details.env
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‎samples/chaincode/confidential-escrow/Makefile‎

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TOP = ../../..
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include $(TOP)/ecc_go/build.mk
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CC_NAME ?= confidential-escrow
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EGO_CONFIG_FILE = $(FPC_PATH)/samples/chaincode/confidential-escrow/confidentialEscrowEnclave.json
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ECC_MAIN_FILES=$(FPC_PATH)/samples/chaincode/confidential-escrow

‎samples/chaincode/confidential-escrow/README.md‎

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## Optimal Project Structure
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```
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$FPC_PATH/samples/chaincode/confidential-escrow/
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├── main.go # FPC chaincode entry point
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├── Makefile # Build configuration
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├── confidential-escrow-compose.yaml # Docker compose for ECC services
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├── confidentialEscrowEnclave.json # SGX enclave configuration
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├── setup.sh # Project setup script
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├── testTutorial.sh # Testing script
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├── chaincode/
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│ ├── confidential_escrow.go # Main chaincode logic
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│ ├── assets/
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│ │ ├── digital_asset.go # Digital asset token structure
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│ │ ├── wallet.go # Wallet structure and operations
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│ │ ├── escrow.go # Escrow contract structure
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│ │ └── user_directory.go # User directory mapping
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│ ├── transactions/
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│ │ ├── wallet_ops.go # Wallet creation, balance queries
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│ │ ├── token_ops.go # Mint, transfer operations
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│ │ ├── escrow_ops.go # Escrow creation, release, refund
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│ │ └── admin_ops.go # Admin functions, schema queries
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│ └── utils/
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│ ├── crypto_utils.go # Hashing, signature verification
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│ ├── auth_utils.go # Certificate-based authentication
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│ └── validation_utils.go # Input validation and checks
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├── go.mod # Go module dependencies
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├── go.sum # Dependency checksums
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└── README.md # Project documentation
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```
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## Revised Implementation Plan (12 Weeks)
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### Phase 1: FPC Environment & Project Bootstrap (Week 1-2)
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#### Step 1: FPC Environment Verification
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- Verify existing FPC setup and SGX functionality
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- Test existing examples (kv-test-go, cc-tools-demo)
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- Understand FPC build process and deployment workflow
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- Study the existing sample structures and patterns
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#### Step 2: Project Structure Creation
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- Create `confidential-escrow` directory in `$FPC_PATH/samples/chaincode/`
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- Copy and adapt `main.go` from kv-test-go (use CHAINCODE_PKG_ID pattern)
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- Create basic `Makefile` following existing examples
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- Set up `confidentialEscrowEnclave.json` with proper SGX configuration
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- Create `confidential-escrow-compose.yaml` for ECC services
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#### Step 3: Basic Chaincode Shell
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- Implement basic chaincode structure with function dispatcher (like kv-test pattern)
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- Add initialization logic and basic error handling
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- Create placeholder transaction functions
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- Test basic deployment and invocation using FPC tutorial steps
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### Phase 2: Core Data Models & Basic Operations (Week 3-4)
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#### Step 4: Asset Structure Implementation
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- Implement Digital Asset Token struct in `assets/digital_asset.go`
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- Create Wallet struct with encrypted balance in `assets/wallet.go`
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- Implement UserDirectory mapping in `assets/user_directory.go`
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- Add basic serialization/deserialization using JSON
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- Test basic state storage and retrieval
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#### Step 5: Cryptographic & Authentication Utilities
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- Implement SHA-256 hashing in `utils/crypto_utils.go`
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- Add ECDSA signature verification utilities
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- Create certificate handling in `utils/auth_utils.go` using `stub.GetCreator()`
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- Implement UUID generation for wallet and escrow IDs
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- Add input validation framework in `utils/validation_utils.go`
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#### Step 6: Basic Ledger Operations
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- Implement key formatting (userdir:hash, wallet:uuid patterns)
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- Create secure state read/write operations within SGX
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- Add basic CRUD operations for each asset type
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- Test data persistence and retrieval through FPC client
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- Verify data confidentiality (peers see encrypted blobs only)
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### Phase 3: Wallet Management System (Week 5-6)
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#### Step 7: Wallet Creation & Authentication
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- Implement `createWallet` transaction in `transactions/wallet_ops.go`
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- Add certificate-based user authentication using `stub.GetCreator()`
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- Create userdir mapping and wallet ID generation
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- Test wallet creation through FPC client
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- Verify ownership authentication works correctly
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#### Step 8: Wallet Operations & Token Management
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- Implement `getBalance` with proper access control
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- Create `mintToken` transaction (issuer-only) in `transactions/token_ops.go`
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- Add `transferToken` transaction with balance validation
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- Implement proper balance updates and overflow protection
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- Test all wallet operations end-to-end
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#### Step 9: Advanced Wallet Features
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- Add wallet metadata management
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- Implement audit trails for token operations
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- Create role-based access control (issuer vs users)
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- Add comprehensive error handling and validation
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- Performance testing for wallet operations
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### Phase 4: Escrow System Core (Week 7-8)
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#### Step 10: Escrow Contract Foundation
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- Implement Escrow struct in `assets/escrow.go`
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- Create `createEscrow` transaction in `transactions/escrow_ops.go`
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- Add fund locking mechanism (debit buyer wallet)
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- Implement escrow status management (Active, Released, Refunded)
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- Test basic escrow creation and fund locking
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#### Step 11: Condition System Implementation
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- Implement hashlock condition verification (SHA-256 matching)
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- Add signature-based condition verification (ECDSA)
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- Create condition evaluation engine within SGX
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- Test condition verification with test secrets/signatures
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- Add proper error handling for invalid conditions
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#### Step 12: Fund Release & Refund Mechanisms
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- Implement `releaseEscrow` transaction for successful conditions
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- Add automatic fund transfer from escrow to seller wallet
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- Create `refundEscrow` transaction for failed/expired escrows
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- Implement comprehensive escrow state updates
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- Test complete escrow lifecycle (create → condition → release)
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### Phase 5: Integration & Advanced Features (Week 9-10)
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#### Step 13: FPC Client Integration & Testing
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- Create comprehensive test suite using FPC client
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- Test all transactions through encrypted FPC communication
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- Verify end-to-end privacy (no data leakage to peers)
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- Performance benchmarking and optimization
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- Load testing with multiple concurrent operations
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#### Step 14: Advanced Escrow Features
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- Implement multi-condition escrows (AND/OR logic)
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- Add partial release mechanisms
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- Create escrow templates for common use cases
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- Implement escrow modification and extension capabilities
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- Add dispute resolution framework basics
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#### Step 15: Security Hardening & Optimization
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- Comprehensive input validation and sanitization
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- Protection against common attack vectors
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- Secure error handling without information leakage
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- Memory optimization for SGX enclave
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- Rate limiting and DoS protection
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### Phase 6: Production Features & Documentation (Week 11-12)
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#### Step 16: Demo Application & Real-world Scenarios
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- Create client application demonstrating all features
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- Implement atomic swaps between different asset types
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- Add multi-party escrow scenarios
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- Test cross-chain escrow capabilities (if applicable)
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- Create realistic use case demonstrations
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#### Step 17: Documentation & Deployment
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- Comprehensive API documentation
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- Deployment guides and configuration management
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- User manuals and tutorials
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- Troubleshooting guides and FAQs
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- Security best practices documentation
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#### Step 18: Final Testing & Optimization
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- End-to-end system testing
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- Security audit and penetration testing
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- Performance optimization and tuning
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- Final integration testing with all components
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- Production readiness assessment
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## Key Differences from Original Plan:
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### **Simplified Structure:**
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- Single chaincode following FPC patterns instead of complex CC-Tools integration
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- Direct implementation in FPC repository for easier dependency management
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- Follows existing sample patterns (kv-test-go structure)
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### **FPC-Specific Considerations:**
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- All sensitive operations run inside SGX enclave
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- Use `CHAINCODE_PKG_ID` instead of `CHAINCODE_ID`
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- Follow FPC build and deployment patterns
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- Leverage existing FPC infrastructure and tooling
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### **Reduced Complexity:**
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- Focus on core functionality first
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- Avoid CC-Tools integration complexity initially
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- Use proven FPC patterns and structures
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- Streamlined 12-week timeline
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### **Testing Approach:**
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- Use FPC client for all testing
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- Follow existing tutorial patterns
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- Test privacy and confidentiality at each step
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- Continuous integration with FPC deployment process

‎samples/chaincode/confidential-escrow/chaincode/assets/digital_asset.go‎

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package assets
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import (
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"github.com/hyperledger-labs/cc-tools/assets"
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)
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var DigitalAssetToken = assets.AssetType{
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Tag: "digitalAsset",
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Label: "Digital Asset Token",
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Description: "Confidential digital currency token (e.g., CBDC)",
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Props: []assets.AssetProp{
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{
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Tag: "name",
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Label: "Token Name",
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DataType: "string",
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Required: true,
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},
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{
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Tag: "symbol",
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Label: "Token Symbol",
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DataType: "string",
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Required: true,
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},
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{
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Tag: "decimals",
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Label: "Decimal Places",
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DataType: "number",
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Required: true,
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},
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{
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Tag: "totalSupply",
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Label: "Total Supply",
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DataType: "number",
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Required: true,
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},
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{
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Tag: "issuerHash",
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Label: "Issuer Certificate Hash",
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DataType: "string",
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Required: true,
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},
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},
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Readers: []string{"$org1MSP", "$org2MSP"},
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}

‎samples/chaincode/confidential-escrow/chaincode/assets/user_directory.go‎

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package assets
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import (
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"github.com/hyperledger-labs/cc-tools/assets"
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)
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var UserDirectory = assets.AssetType{
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Tag: "userdir",
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Label: "User Directory",
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Description: "Maps user public key hash to wallet ID for authentication",
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Props: []assets.AssetProp{
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{
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Tag: "publicKeyHash",
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Label: "Public Key Hash",
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DataType: "String",
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Required: true,
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IsKey: true,
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},
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{
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Tag: "walletId",
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Label: "Associated Wallet ID",
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DataType: "string",
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Required: true,
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},
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{
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Tag: "certHash",
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Label: "Certificate Hash",
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DataType: "string",
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Required: true,
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},
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},
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Readers: []string{"$org1MSP", "$org2MSP"},
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}

‎samples/chaincode/confidential-escrow/chaincode/assets/wallet.go‎

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package assets
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import (
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"github.com/hyperledger-labs/cc-tools/assets"
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)
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// Wallet represents a confidential user wallet
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var Wallet = assets.AssetType{
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Tag: "wallet",
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Label: "User Wallet",
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Description: "Confidential wallet holding digital assets",
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Props: []assets.AssetProp{
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{
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Tag: "walletId",
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Label: "Wallet ID",
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DataType: "string",
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Required: true,
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IsKey: true, // primary key
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},
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{
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Tag: "ownerCertHash",
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Label: "Owner Certificate Hash",
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DataType: "string",
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Required: true,
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},
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{
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Tag: "balance",
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Label: "Token Balance",
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DataType: "number",
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Required: true,
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},
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{
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Tag: "assetType",
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Label: "Asset Type Reference",
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DataType: "@digitalAsset", // References digitalAsset
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Required: true,
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},
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{
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Tag: "createdAt",
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Label: "Creation Timestamp",
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DataType: "datetime",
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Required: true,
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},
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},
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Readers: []string{"$org1MSP", "$org2MSP"},
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}

‎samples/chaincode/confidential-escrow/chaincode/header/header.go‎

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package header
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var (
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Name = "Confidential Escrow"
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Version = "1.0.0"
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Colors = map[string][]string{
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"@default": {"#4267B2", "#34495E", "#ECF0F1"},
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}
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Title = map[string]string{
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"@default": "Confidential Digital Assets & Programmable Escrow",
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}
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)

‎samples/chaincode/confidential-escrow/confidential-escrow-compose.yaml‎

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services:
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# org1
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ecc.peer0.org1.example.com:
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environment:
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- RUN_CCAAS=true
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- FPC_ENABLED=true
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# org2
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ecc.peer0.org2.example.com:
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environment:
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- RUN_CCAAS=true
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- FPC_ENABLED=true

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