hyperledger · PsychoPunkSage · Aug 13, 2025 · Aug 15, 2025 · Aug 15, 2025 · Aug 15, 2025
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+ecc
+ecc-bundle
+enclave.json
+private.pem
+public.pem
+mrenclave
+details.env
+
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+TOP = ../../..
+include $(TOP)/ecc_go/build.mk
+
+CC_NAME ?= confidential-escrow
+
+EGO_CONFIG_FILE = $(FPC_PATH)/samples/chaincode/confidential-escrow/confidentialEscrowEnclave.json
+ECC_MAIN_FILES=$(FPC_PATH)/samples/chaincode/confidential-escrow
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+## Optimal Project Structure
+
+```
+$FPC_PATH/samples/chaincode/confidential-escrow/
+├── main.go                           # FPC chaincode entry point
+├── Makefile                          # Build configuration
+├── confidential-escrow-compose.yaml  # Docker compose for ECC services
+├── confidentialEscrowEnclave.json    # SGX enclave configuration
+├── setup.sh                         # Project setup script
+├── testTutorial.sh                   # Testing script
+├── chaincode/
+│   ├── confidential_escrow.go        # Main chaincode logic
+│   ├── assets/
+│   │   ├── digital_asset.go          # Digital asset token structure
+│   │   ├── wallet.go                 # Wallet structure and operations
+│   │   ├── escrow.go                 # Escrow contract structure
+│   │   └── user_directory.go         # User directory mapping
+│   ├── transactions/
+│   │   ├── wallet_ops.go             # Wallet creation, balance queries
+│   │   ├── token_ops.go              # Mint, transfer operations
+│   │   ├── escrow_ops.go             # Escrow creation, release, refund
+│   │   └── admin_ops.go              # Admin functions, schema queries
+│   └── utils/
+│       ├── crypto_utils.go           # Hashing, signature verification
+│       ├── auth_utils.go             # Certificate-based authentication
+│       └── validation_utils.go       # Input validation and checks
+├── go.mod                            # Go module dependencies
+├── go.sum                            # Dependency checksums
+└── README.md                         # Project documentation
+```
+
+## Revised Implementation Plan (12 Weeks)
+
+### Phase 1: FPC Environment & Project Bootstrap (Week 1-2)
+
+#### Step 1: FPC Environment Verification
+
+- Verify existing FPC setup and SGX functionality
+- Test existing examples (kv-test-go, cc-tools-demo)
+- Understand FPC build process and deployment workflow
+- Study the existing sample structures and patterns
+
+#### Step 2: Project Structure Creation
+
+- Create `confidential-escrow` directory in `$FPC_PATH/samples/chaincode/`
+- Copy and adapt `main.go` from kv-test-go (use CHAINCODE_PKG_ID pattern)
+- Create basic `Makefile` following existing examples
+- Set up `confidentialEscrowEnclave.json` with proper SGX configuration
+- Create `confidential-escrow-compose.yaml` for ECC services
+
+#### Step 3: Basic Chaincode Shell
+
+- Implement basic chaincode structure with function dispatcher (like kv-test pattern)
+- Add initialization logic and basic error handling
+- Create placeholder transaction functions
+- Test basic deployment and invocation using FPC tutorial steps
+
+### Phase 2: Core Data Models & Basic Operations (Week 3-4)
+
+#### Step 4: Asset Structure Implementation
+
+- Implement Digital Asset Token struct in `assets/digital_asset.go`
+- Create Wallet struct with encrypted balance in `assets/wallet.go`
+- Implement UserDirectory mapping in `assets/user_directory.go`
+- Add basic serialization/deserialization using JSON
+- Test basic state storage and retrieval
+
+#### Step 5: Cryptographic & Authentication Utilities
+
+- Implement SHA-256 hashing in `utils/crypto_utils.go`
+- Add ECDSA signature verification utilities
+- Create certificate handling in `utils/auth_utils.go` using `stub.GetCreator()`
+- Implement UUID generation for wallet and escrow IDs
+- Add input validation framework in `utils/validation_utils.go`
+
+#### Step 6: Basic Ledger Operations
+
+- Implement key formatting (userdir:hash, wallet:uuid patterns)
+- Create secure state read/write operations within SGX
+- Add basic CRUD operations for each asset type
+- Test data persistence and retrieval through FPC client
+- Verify data confidentiality (peers see encrypted blobs only)
+
+### Phase 3: Wallet Management System (Week 5-6)
+
+#### Step 7: Wallet Creation & Authentication
+
+- Implement `createWallet` transaction in `transactions/wallet_ops.go`
+- Add certificate-based user authentication using `stub.GetCreator()`
+- Create userdir mapping and wallet ID generation
+- Test wallet creation through FPC client
+- Verify ownership authentication works correctly
+
+#### Step 8: Wallet Operations & Token Management
+
+- Implement `getBalance` with proper access control
+- Create `mintToken` transaction (issuer-only) in `transactions/token_ops.go`
+- Add `transferToken` transaction with balance validation
+- Implement proper balance updates and overflow protection
+- Test all wallet operations end-to-end
+
+#### Step 9: Advanced Wallet Features
+
+- Add wallet metadata management
+- Implement audit trails for token operations
+- Create role-based access control (issuer vs users)
+- Add comprehensive error handling and validation
+- Performance testing for wallet operations
+
+### Phase 4: Escrow System Core (Week 7-8)
+
+#### Step 10: Escrow Contract Foundation
+
+- Implement Escrow struct in `assets/escrow.go`
+- Create `createEscrow` transaction in `transactions/escrow_ops.go`
+- Add fund locking mechanism (debit buyer wallet)
+- Implement escrow status management (Active, Released, Refunded)
+- Test basic escrow creation and fund locking
+
+#### Step 11: Condition System Implementation
+
+- Implement hashlock condition verification (SHA-256 matching)
+- Add signature-based condition verification (ECDSA)
+- Create condition evaluation engine within SGX
+- Test condition verification with test secrets/signatures
+- Add proper error handling for invalid conditions
+
+#### Step 12: Fund Release & Refund Mechanisms
+
+- Implement `releaseEscrow` transaction for successful conditions
+- Add automatic fund transfer from escrow to seller wallet
+- Create `refundEscrow` transaction for failed/expired escrows
+- Implement comprehensive escrow state updates
+- Test complete escrow lifecycle (create → condition → release)
+
+### Phase 5: Integration & Advanced Features (Week 9-10)
+
+#### Step 13: FPC Client Integration & Testing
+
+- Create comprehensive test suite using FPC client
+- Test all transactions through encrypted FPC communication
+- Verify end-to-end privacy (no data leakage to peers)
+- Performance benchmarking and optimization
+- Load testing with multiple concurrent operations
+
+#### Step 14: Advanced Escrow Features
+
+- Implement multi-condition escrows (AND/OR logic)
+- Add partial release mechanisms
+- Create escrow templates for common use cases
+- Implement escrow modification and extension capabilities
+- Add dispute resolution framework basics
+
+#### Step 15: Security Hardening & Optimization
+
+- Comprehensive input validation and sanitization
+- Protection against common attack vectors
+- Secure error handling without information leakage
+- Memory optimization for SGX enclave
+- Rate limiting and DoS protection
+
+### Phase 6: Production Features & Documentation (Week 11-12)
+
+#### Step 16: Demo Application & Real-world Scenarios
+
+- Create client application demonstrating all features
+- Implement atomic swaps between different asset types
+- Add multi-party escrow scenarios
+- Test cross-chain escrow capabilities (if applicable)
+- Create realistic use case demonstrations
+
+#### Step 17: Documentation & Deployment
+
+- Comprehensive API documentation
+- Deployment guides and configuration management
+- User manuals and tutorials
+- Troubleshooting guides and FAQs
+- Security best practices documentation
+
+#### Step 18: Final Testing & Optimization
+
+- End-to-end system testing
+- Security audit and penetration testing
+- Performance optimization and tuning
+- Final integration testing with all components
+- Production readiness assessment
+
+## Key Differences from Original Plan:
+
+### **Simplified Structure:**
+
+- Single chaincode following FPC patterns instead of complex CC-Tools integration
+- Direct implementation in FPC repository for easier dependency management
+- Follows existing sample patterns (kv-test-go structure)
+
+### **FPC-Specific Considerations:**
+
+- All sensitive operations run inside SGX enclave
+- Use `CHAINCODE_PKG_ID` instead of `CHAINCODE_ID`
+- Follow FPC build and deployment patterns
+- Leverage existing FPC infrastructure and tooling
+
+### **Reduced Complexity:**
+
+- Focus on core functionality first
+- Avoid CC-Tools integration complexity initially
+- Use proven FPC patterns and structures
+- Streamlined 12-week timeline
+
+### **Testing Approach:**
+
+- Use FPC client for all testing
+- Follow existing tutorial patterns
+- Test privacy and confidentiality at each step
+- Continuous integration with FPC deployment process
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+package assets
+
+import (
+	"github.com/hyperledger-labs/cc-tools/assets"
+)
+
+var DigitalAssetToken = assets.AssetType{
+	Tag:         "digitalAsset",
+	Label:       "Digital Asset Token",
+	Description: "Confidential digital currency token (e.g., CBDC)",
+
+	Props: []assets.AssetProp{
+		{
+			Tag:      "name",
+			Label:    "Token Name",
+			DataType: "string",
+			Required: true,
+		},
+		{
+			Tag:      "symbol",
+			Label:    "Token Symbol",
+			DataType: "string",
+			Required: true,
+		},
+		{
+			Tag:      "decimals",
+			Label:    "Decimal Places",
+			DataType: "number",
+			Required: true,
+		},
+		{
+			Tag:      "totalSupply",
+			Label:    "Total Supply",
+			DataType: "number",
+			Required: true,
+		},
+		{
+			Tag:      "issuerHash",
+			Label:    "Issuer Certificate Hash",
+			DataType: "string",
+			Required: true,
+		},
+	},
+
+	Readers: []string{"$org1MSP", "$org2MSP"},
+}
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+package assets
+
+import (
+	"github.com/hyperledger-labs/cc-tools/assets"
+)
+
+var UserDirectory = assets.AssetType{
+	Tag:         "userdir",
+	Label:       "User Directory",
+	Description: "Maps user public key hash to wallet ID for authentication",
+
+	Props: []assets.AssetProp{
+		{
+			Tag:      "publicKeyHash",
+			Label:    "Public Key Hash",
+			DataType: "String",
+			Required: true,
+			IsKey:    true,
+		},
+		{
+			Tag:      "walletId",
+			Label:    "Associated Wallet ID",
+			DataType: "string",
+			Required: true,
+		},
+		{
+			Tag:      "certHash",
+			Label:    "Certificate Hash",
+			DataType: "string",
+			Required: true,
+		},
+	},
+
+	Readers: []string{"$org1MSP", "$org2MSP"},
+}
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+package assets
+
+import (
+	"github.com/hyperledger-labs/cc-tools/assets"
+)
+
+// Wallet represents a confidential user wallet
+var Wallet = assets.AssetType{
+	Tag:         "wallet",
+	Label:       "User Wallet",
+	Description: "Confidential wallet holding digital assets",
+
+	Props: []assets.AssetProp{
+		{
+			Tag:      "walletId",
+			Label:    "Wallet ID",
+			DataType: "string",
+			Required: true,
+			IsKey:    true, // primary key
+		},
+		{
+			Tag:      "ownerCertHash",
+			Label:    "Owner Certificate Hash",
+			DataType: "string",
+			Required: true,
+		},
+		{
+			Tag:      "balance",
+			Label:    "Token Balance",
+			DataType: "number",
+			Required: true,
+		},
+		{
+			Tag:      "assetType",
+			Label:    "Asset Type Reference",
+			DataType: "@digitalAsset", // References digitalAsset
+			Required: true,
+		},
+		{
+			Tag:      "createdAt",
+			Label:    "Creation Timestamp",
+			DataType: "datetime",
+			Required: true,
+		},
+	},
+
+	Readers: []string{"$org1MSP", "$org2MSP"},
+}
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+package header
+
+var (
+	Name    = "Confidential Escrow"
+	Version = "1.0.0"
+	Colors  = map[string][]string{
+		"@default": {"#4267B2", "#34495E", "#ECF0F1"},
+	}
+	Title = map[string]string{
+		"@default": "Confidential Digital Assets & Programmable Escrow",
+	}
+)
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+services:
+  #  org1
+  ecc.peer0.org1.example.com:
+    environment:
+      - RUN_CCAAS=true
+      - FPC_ENABLED=true
+
+  # org2
+  ecc.peer0.org2.example.com:
+    environment:
+      - RUN_CCAAS=true
+      - FPC_ENABLED=true