⚠️ EXPERIMENTAL PROJECT - This is a proof-of-concept implementation and should not be used in production environments.

A cryptographically verifiable, append-only, event-sourced ledger system designed for core banking and e-money applications. LedgerFS aims to outperform traditional RDBMS in audit-focused, high-throughput, tamper-evident environments while providing inherent regulatory compliance.

LedgerFS is designed to be the foundation for next-generation financial systems that require:

• Cryptographic Verification: Every transaction is cryptographically signed and verifiable
• Append-Only Immutability: No data can be modified or deleted, ensuring complete audit trails
• High-Throughput Performance: Target >50,000 TPS with <100ms P95 write latency
• Regulatory Compliance: Built-in support for PSD2, Basel III, and e-money safeguarding
• Event Sourcing: Complete system state reconstruction from immutable event log
• FUSE Integration: Filesystem interface for seamless integration with existing tools

This project is in early experimental development. Current implementations include:

• Core Event System: Comprehensive event schema with cryptographic hashing
• Event Store: RocksDB-based LSM tree storage with append-only semantics
• Batch Processing: High-throughput batching system targeting >50K TPS
• FUSE Filesystem: Basic filesystem interface for ledger data access
• Serialization: Optimized binary serialization with LZ4 compression
• Project Infrastructure: Modular Rust workspace architecture

• Read Optimization: Performance tuning for <50ms P95 read latency
• Command Processing: CQRS command handling and validation
• Merkle Trees: Cryptographic verification and tamper detection
• Recovery Mechanisms: Crash recovery and consistency checking

• Cryptographic Chaining: Block-chain inspired event chaining
• Read Models: Optimized query interfaces for different use cases
• Event Streaming: Real-time event distribution and replication
• Regulatory Reporting: Automated compliance reporting tools
• Performance Benchmarks: Comprehensive performance testing suite

LedgerFS uses a modular architecture built in Rust:

ledgerfs/
├── crates/
│   ├── ledgerfs-core/          # Core types, events, and traits
│   ├── ledgerfs-event-store/   # Event storage and batch processing
│   ├── ledgerfs-fuse/          # FUSE filesystem implementation
│   ├── ledgerfs-command/       # Command processing (planned)
│   ├── ledgerfs-query/         # Read models and queries (planned)
│   └── ledgerfs-crypto/        # Cryptographic operations (planned)
└── docs/                       # Documentation and specifications

• Storage: RocksDB with LSM trees for high-throughput writes
• Serialization: Bincode with LZ4 compression for performance
• Async Runtime: Tokio for high-concurrency operations
• Filesystem: FUSE for seamless OS integration
• Cryptography: SHA-256 hashing with planned Merkle tree verification

• Rust 1.70+ with Cargo
• FUSE development libraries (libfuse-dev on Ubuntu/Debian)
• RocksDB development libraries

# Clone the repository
git clone https://github.com/yourusername/ledgerfs.git
cd ledgerfs

# Build all crates
cargo build

# Run tests
cargo test

# Build FUSE binary
cargo build --bin ledgerfs-fuse

# Create mount point
mkdir /tmp/ledgerfs_mount

# Mount the filesystem
./target/debug/ledgerfs-fuse /tmp/ledgerfs_mount

# In another terminal, explore the filesystem
ls -la /tmp/ledgerfs_mount/

# Unmount when done
fusermount -u /tmp/ledgerfs_mount

LedgerFS is designed for financial applications requiring:

• Core Banking Systems: Account management, transaction processing
• E-Money Platforms: Digital wallet and payment processing
• Audit Systems: Immutable transaction logs for compliance
• Regulatory Reporting: Automated compliance data generation
• Financial Analytics: Event-sourced data for real-time insights

• Experimental Status: This project is in early development and not production-ready
• Security: Cryptographic implementations are not yet audited
• Performance: Current performance metrics are preliminary
• API Stability: APIs may change significantly during development
• Data Safety: Do not use with real financial data

This project is currently in experimental development. Contributions, feedback, and discussions are welcome:

1. Check existing issues and discussions
2. Fork the repository
3. Create a feature branch
4. Submit a pull request with detailed description

This project is licensed under the Apache License 2.0 - see the LICENSE file for details.

• Event Store - Event sourcing database
• RocksDB - High-performance key-value store
• FUSE - Filesystem in userspace

Note: This is an experimental project exploring the intersection of event sourcing, cryptographic verification, and high-performance storage for financial applications. It is not intended for production use and should be considered a research and development effort.