AnchorKit

AnchorKit is a Soroban-native toolkit for anchoring off-chain attestations to Stellar. It enables smart contracts to verify real-world events such as KYC approvals, payment confirmations, and signed claims in a trust-minimized way.

Features

• Attestation management with replay attack protection
• Attestor registration and revocation
• Endpoint configuration for attestors
• Service capability discovery (deposits, withdrawals, quotes, KYC)
• Anchor Info Discovery (fetch and parse stellar.toml, cache assets/fees/limits)
• Health monitoring (latency, failures, availability)
• Metadata caching (TTL-based with manual refresh)
• Request ID propagation (UUID per flow with tracing)
• Event emission for all state changes
• Comprehensive error handling with stable error codes

Supported Services

Anchors can configure which services they support:

• Deposits: Accept incoming deposits from users
• Withdrawals: Process withdrawal requests
• Quotes: Provide exchange rate quotes
• KYC: Perform Know Your Customer verification

Usage Example

// Initialize the contract
contract.initialize(&admin);

// Register an attestor/anchor
contract.register_attestor(&anchor);

// Configure supported services for the anchor
let mut services = Vec::new(&env);
services.push_back(ServiceType::Deposits);
services.push_back(ServiceType::Withdrawals);
services.push_back(ServiceType::KYC);
contract.configure_services(&anchor, &services);

// Query supported services
let supported = contract.get_supported_services(&anchor);

// Check if a specific service is supported
if contract.supports_service(&anchor, &ServiceType::Deposits) {
    // Process deposit
}

CLI Example

See complete deposit/withdraw workflow:

# Run bash demo
./examples/cli_example.sh

# Or run Rust example
cargo run --example cli_example

See CLI_EXAMPLE.md for full documentation.

Key Features

• Attestation Management: Register attestors, submit and retrieve attestations
• Endpoint Configuration: Manage attestor endpoints for off-chain integration
• Unified Anchor Adapter: Consistent API for multiple anchor integrations
• Session Management: Group operations into logical sessions for traceability
• Audit Trail: Complete immutable record of all operations
• Reproducibility: Deterministic operation replay for verification
• Replay Protection: Multi-level protection against unauthorized replays
• Secure Credential Management: Runtime credential injection with automatic rotation

New: Session Traceability & Reproducibility

AnchorKit now includes comprehensive session management and operation tracing to ensure all anchor interactions are reproducible and traceable.

What This Means

• Every operation is logged with complete context (who, what, when, result)
• Sessions group related operations for logical organization
• Audit trail is immutable for compliance and verification
• Operations can be replayed deterministically for reproducibility
• Replay attacks are prevented through nonce-based protection

Quick Example

// Create a session
const sessionId = await contract.create_session(userAddress);

// Perform operations within the session
const attestationId = await contract.submit_attestation_with_session(
    sessionId,
    issuer,
    subject,
    timestamp,
    payloadHash,
    signature
);

// Verify session completeness
const operationCount = await contract.get_session_operation_count(sessionId);

// Retrieve audit logs
const auditLog = await contract.get_audit_log(0);

Documentation

Getting Started

• QUICK_START.md - Quick reference guide with examples

Feature Documentation

• ANCHOR_INFO_DISCOVERY.md - Anchor info discovery service (stellar.toml)
• ANCHOR_ADAPTER.md - Unified anchor adapter interface
• SESSION_TRACEABILITY.md - Complete feature guide with usage patterns
• SECURE_CREDENTIALS.md - Secure credential injection and management
• HEALTH_MONITORING.md - Anchor health monitoring interface
• METADATA_CACHE.md - Metadata and capabilities caching
• REQUEST_ID_PROPAGATION.md - Request ID tracking and tracing
• API_SPEC.md - API specification and error codes

Technical Documentation

• IMPLEMENTATION_GUIDE.md - Technical implementation details
• IMPLEMENTATION_SUMMARY.md - Implementation overview
• DEPLOYMENT_WITH_CREDENTIALS.md - Deployment guide with secure credentials
• VERIFICATION_CHECKLIST.md - Verification and quality assurance

New API Methods

Session Management

• create_session(initiator) - Create new session
• get_session(session_id) - Get session details
• get_session_operation_count(session_id) - Get operation count
• get_audit_log(log_id) - Get audit log entry

Session-Aware Operations

• submit_attestation_with_session(...) - Submit attestation with logging
• register_attestor_with_session(...) - Register attestor with logging
• revoke_attestor_with_session(...) - Revoke attestor with logging

New Data Structures

• InteractionSession - Represents a session with metadata
• OperationContext - Captures operation details
• AuditLog - Complete audit entry

New Events

• SessionCreated - Emitted when session is created
• OperationLogged - Emitted when operation is logged

Platform Support

AnchorKit is designed to work seamlessly across all major platforms:

• ✅ Linux (Ubuntu, Debian, Fedora, etc.)
• ✅ macOS (Intel and Apple Silicon)
• ✅ Windows (10/11 with PowerShell)

Cross-Platform Features

• Path Handling: All file operations use platform-agnostic APIs (std::path::Path in Rust, pathlib.Path in Python)
• Scripts: Both bash (Unix) and PowerShell (Windows) versions provided
• Testing: Comprehensive cross-platform test suite included
• CI/CD: Automated testing on Linux, macOS, and Windows

Platform-Specific Setup

• Linux/macOS: See main setup instructions below
• Windows: See WINDOWS_SETUP.md for detailed Windows-specific guide

Building

Linux/macOS

cargo build --release

Windows

cargo build --release

For detailed Windows setup instructions, including IDE configuration and troubleshooting, see WINDOWS_SETUP.md.

CLI Usage

AnchorKit now includes a comprehensive CLI tool for interacting with the smart contract. Each command includes helpful examples and clear descriptions.

Getting Help

View all available commands:

anchorkit --help

Get detailed help for any command:

anchorkit deploy --help
anchorkit register --help

Common Workflows

1. Build and Deploy

# Build the contract
anchorkit build --release

# Deploy to testnet
anchorkit deploy --network testnet

# Initialize with admin account
anchorkit init --admin GADMIN123...

2. Register an Attestor

# Basic registration
anchorkit register --address GANCHOR123...

# Register with services
anchorkit register --address GANCHOR123... \
  --services deposits,withdrawals,kyc \
  --endpoint https://anchor.example.com

3. Submit Attestations

# Submit attestation
anchorkit attest --subject GUSER123... --payload-hash abc123...

# Submit with session tracking
anchorkit attest --subject GUSER123... \
  --payload-hash abc123... \
  --session session-001

4. Monitor Health

# Check all attestors
anchorkit health

# Monitor specific attestor
anchorkit health --attestor GANCHOR123... --watch --interval 30

Available Commands

• build - Build the smart contract
• deploy - Deploy to Stellar network
• init - Initialize contract with admin
• register - Register new attestor
• attest - Submit attestation
• query - Query attestation by ID
• health - Check attestor health
• test - Run contract tests
• validate - Validate configuration files
• doctor - Run environment diagnostics

Each command includes:

• Clear description of when to use it
• Real-world usage examples
• All available options and flags
• Network selection support

Environment Diagnostics

The doctor command helps troubleshoot environment setup issues:

# Check your development environment
anchorkit doctor

The doctor command checks:

• ✅ Rust toolchain installation
• ✅ WASM target availability
• ✅ Wallet configuration
• ✅ RPC endpoint connectivity
• ✅ Config file validity
• ✅ Network connectivity

See DOCTOR_COMMAND.md for complete documentation.

Testing

The contract includes comprehensive tests for all functionality, including cross-platform compatibility:

Linux/macOS

# Run all tests
cargo test

# Run cross-platform path tests
cargo test cross_platform

# Run with verbose output
cargo test --verbose

Windows

# Run all tests
cargo test

# Run cross-platform path tests
cargo test cross_platform

# Run with verbose output
cargo test --verbose

Configuration Validation

Linux/macOS

# Validate all configurations
./validate_all.sh

# Pre-deployment validation
./pre_deploy_validate.sh

Windows

# Validate all configurations
.\validate_all.ps1

# Pre-deployment validation
.\pre_deploy_validate.ps1

Backward Compatibility

All existing methods remain unchanged. Session features are opt-in, allowing gradual adoption.

Use Cases

Compliance & Audit

• Complete audit trail for regulatory compliance
• Immutable operation records
• Actor tracking for accountability

Reproducibility

• Deterministic operation replay
• Session-based operation grouping
• Complete context preservation

Security

• Replay attack prevention
• Multi-level protection
• Nonce-based verification

Architecture

AnchorKit consists of:

• Core Contract (src/lib.rs) - Main contract logic
• Storage Layer (src/storage.rs) - Persistent data management
• Event System (src/events.rs) - Event definitions and publishing
• Type System (src/types.rs) - Data structures
• Error Handling (src/errors.rs) - Error codes and definitions

Security

• Stable error codes (100-120) for API compatibility
• Replay protection at multiple levels
• Immutable audit logs
• Authorization checks on all operations
• Complete operation context for verification

Performance

• Efficient storage with TTL management
• Minimal event data
• Sequential IDs (no hash lookups)
• Optimized for Soroban constraints

License

[Add your license here]

Support

For questions or issues:

1. Check the documentation files
2. Review the API specification
3. Examine the test cases in src/lib.rs