---
title: "Layer2 Solutions Documentation"
description: "Bitcoin Layer2 protocols framework implemented in Anya Core"
---
# Layer2 Bitcoin Solutions [AIR-3][AIS-3][BPC-3]
## Overview
Anya Core provides a comprehensive framework for Bitcoin Layer2 protocols, implementing standardized interfaces and foundational components for scalable Bitcoin applications. The framework supports multiple Layer2 technologies with a unified async trait interface.
## Table of Contents
- [Implementation Status](#implementation-status)
- [Architecture](#architecture)
- [Protocol Framework](#protocol-framework)
- [Usage Examples](#usage-examples)
- [Development](#development)
- [Testing](#testing)
## Implementation Status
### 🟢 Framework Complete
**Core Layer2 Infrastructure:**
- Unified async trait interface (`Layer2Protocol`)
- Protocol manager for multi-protocol coordination
- Standardized error handling and state management
- Configuration system for all protocols
- Comprehensive testing framework
### 🟡 Active Development
| **Lightning Network** | 🟡 Framework Ready | ✅ Complete | 🔄 In Progress | Payment channel foundation implemented |
| **RGB Protocol** | 🟡 Framework Ready | ✅ Complete | 🔄 In Progress | Asset management framework ready |
| **State Channels** | 🟡 Framework Ready | ✅ Complete | 🔄 In Progress | Generalized state management |
| **DLC** | 🟡 Framework Ready | ✅ Complete | 🔄 In Progress | Oracle integration planned |
| **Taproot Assets** | 🟡 Framework Ready | ✅ Complete | 🔄 In Progress | Asset issuance foundation |
### 🔴 Planned Implementation
| **BOB Protocol** | 🔴 Planned | Q3 2025 | Bitcoin-EVM bridge design complete |
| **RSK Integration** | 🔴 Planned | Q4 2025 | Rootstock sidechain support |
| **Liquid Network** | 🔴 Planned | Q4 2025 | Sidechain integration framework |
| **Stacks** | 🔴 Planned | 2026 | Bitcoin layer smart contracts |
## Protocol Framework
### Core Layer2Protocol Trait
All Layer2 implementations follow a standardized async trait interface:
```rust
use async_trait::async_trait;
use crate::layer2::{AssetParams, AssetTransfer, Layer2Error, Proof, ProtocolState, TransactionStatus, TransferResult, ValidationResult, VerificationResult};
#[async_trait]
pub trait Layer2Protocol: Send + Sync {
// Connection management
async fn initialize(&self) -> Result<(), Layer2Error>;
async fn connect(&self) -> Result<(), Layer2Error>;
// Transaction operations
async fn submit_transaction(&self, tx: &[u8]) -> Result<String, Layer2Error>;
async fn check_transaction_status(&self, tx_id: &str) -> Result<TransactionStatus, Layer2Error>;
// State management
async fn get_state(&self) -> Result<ProtocolState, Layer2Error>;
async fn sync_state(&self) -> Result<(), Layer2Error>;
// Asset operations (optional)
async fn issue_asset(&self, params: AssetParams) -> Result<String, Layer2Error>;
async fn transfer_asset(&self, transfer: AssetTransfer) -> Result<TransferResult, Layer2Error>;
// Verification and validation
async fn verify_proof(&self, proof: &Proof) -> Result<VerificationResult, Layer2Error>;
async fn validate_state(&self) -> Result<ValidationResult, Layer2Error>;
}
```
### Protocol Manager
The Layer2Manager coordinates multiple protocols:
```rust
use anya_core::layer2::{Layer2Manager, Layer2ProtocolType};
let mut manager = Layer2Manager::new();
// Add protocol implementations
manager.add_protocol(Layer2ProtocolType::Lightning, lightning_protocol).await?;
manager.add_protocol(Layer2ProtocolType::RGB, rgb_protocol).await?;
// Submit cross-protocol transactions
let result = manager.submit_transaction(
Layer2ProtocolType::Lightning,
&transaction_data
).await?;
## Architecture
### Implementation Structure
```
src/layer2/
├── mod.rs # Module exports and main types
├── manager.rs # Protocol coordination
├── lightning/ # Lightning Network implementation
│ ├── mod.rs
│ ├── channels.rs
│ └── payments.rs
├── rgb/ # RGB protocol implementation
│ ├── mod.rs
│ ├── assets.rs
│ └── contracts.rs
├── dlc/ # Discrete Log Contracts
│ ├── mod.rs
│ └── oracles.rs
├── state_channels/ # Generalized state channels
│ ├── mod.rs
│ └── dispute.rs
└── taproot_assets.rs # Taproot Assets protocol
```
### Protocol Configuration
Each protocol uses standardized configuration:
```rust
use anya_core::layer2::{LightningConfig, RGBConfig};
// Lightning Network configuration
let lightning_config = LightningConfig {
network: "testnet".to_string(),
node_url: "localhost:10009".to_string(),
data_dir: PathBuf::from("~/.anya/lightning"),
auto_pilot: false,
};
// RGB protocol configuration
let rgb_config = RGBConfig {
network: "testnet".to_string(),
data_dir: PathBuf::from("~/.anya/rgb"),
schema_validation: true,
};
```
## Usage Examples
### Basic Protocol Usage
```rust
use anya_core::layer2::{LightningProtocol, LightningConfig};
#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
// Initialize Lightning protocol
let config = LightningConfig::default_testnet();
let lightning = LightningProtocol::new(config)?;
// Connect to network
lightning.initialize().await?;
lightning.connect().await?;
// Submit transaction
let tx_id = lightning.submit_transaction(&raw_transaction).await?;
println!("Transaction submitted: {}", tx_id);
// Check status
let status = lightning.get_transaction_status(&tx_id).await?;
println!("Transaction status: {:?}", status);
Ok(())
}
```
### Multi-Protocol Operations
```rust
use anya_core::layer2::{Layer2Manager, Layer2ProtocolType};
#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
let mut manager = Layer2Manager::new();
// Initialize multiple protocols
manager.initialize_protocol(Layer2ProtocolType::Lightning).await?;
manager.initialize_protocol(Layer2ProtocolType::RGB).await?;
// Cross-protocol asset transfer
let asset_id = manager.issue_asset(
Layer2ProtocolType::RGB,
AssetParams {
name: "TestAsset".to_string(),
supply: 1000000,
precision: 8,
}
).await?;
// Transfer via Lightning
let transfer_result = manager.transfer_asset(
Layer2ProtocolType::Lightning,
AssetTransfer {
asset_id,
amount: 1000,
recipient: "recipient_address".to_string(),
}
).await?;
Ok(())
}
```
## Development
### Building Layer2 Components
```bash
# Build all Layer2 protocols
cargo build --features "layer2"
# Build specific protocol
cargo build --bin lightning-cli
# Run with debugging
RUST_LOG=debug cargo run --bin layer2-manager
```
### Adding New Protocols
1. **Create Protocol Module:**
```rust
use async_trait::async_trait;
use crate::layer2::Layer2Protocol;
pub struct YourProtocol {
config: YourProtocolConfig,
}
#[async_trait]
impl Layer2Protocol for YourProtocol {
}
```
2. **Add Configuration:**
```rust
#[derive(Debug, Clone)]
pub struct YourProtocolConfig {
pub network: String,
pub endpoint: String,
}
```
3. **Register with Manager:**
```rust
pub enum Layer2ProtocolType {
Lightning,
RGB,
YourProtocol, }
```
## Testing
### Running Tests
```bash
# Run all Layer2 tests
cargo test layer2::
# Run specific protocol tests
cargo test layer2::lightning::
# Run integration tests
cargo test --test layer2_integration_comprehensive
```
### Test Coverage
Current test coverage by protocol:
| Lightning | ✅ 15 tests | ✅ 3 scenarios | 85% |
| RGB | ✅ 12 tests | ✅ 2 scenarios | 80% |
| State Channels | ✅ 8 tests | ✅ 1 scenario | 75% |
| DLC | ✅ 6 tests | 🔄 In Progress | 60% |
| Taproot Assets | ✅ 4 tests | 🔄 In Progress | 50% |
### Protocol Documentation
- [Lightning Network](lightning.md) - Payment channels and routing
- [RGB Protocol](rgb.md) - Client-side asset validation
- [State Channels](state_channels.md) - Generalized off-chain computation
- [DLC](dlc.md) - Oracle-based smart contracts
- [Taproot Assets](taproot_assets.md) - Native Bitcoin asset issuance
- [BOB Protocol](bob.md) - Bitcoin-EVM bridge (planned)
- [RSK Integration](rsk.md) - Rootstock sidechain (planned)
- [Liquid Network](liquid.md) - Confidential sidechains (planned)
- [Stacks](stacks.md) - Bitcoin layer smart contracts (planned)
---
**Last Updated:** June 20, 2025
**Framework Version:** 1.2.0
**Status:** Active Development - Framework Complete, Protocol Implementations In Progress
- **`Layer2ProtocolType`**: Enum of supported Layer2 protocols
- **`ProtocolState`**: Current state of a Layer2 protocol
- **`TransactionStatus`**: Status of transactions (Pending, Confirmed, Failed, Rejected)
- **`AssetParams`**: Parameters for asset issuance
- **`AssetTransfer`**: Asset transfer parameters
- **`TransferResult`**: Result of asset transfer operations
- **`Proof`**: Generic proof structure for verification
- **`VerificationResult`**: Result of proof verification
- **`ValidationResult`**: Result of state validation
### Error Handling
All Layer2 protocol methods use standardized error handling with `Box<dyn std::error::Error + Send + Sync>` for async compatibility and thread safety.
## Development
### Adding a New Protocol
1. Create a new module in `src/layer2/`
2. Implement the `Layer2Protocol` trait
3. Add your protocol to `Layer2ProtocolType` enum
4. Export your module in `src/layer2/mod.rs`
5. Add comprehensive tests
6. Update documentation
### Testing
Run all Layer2 protocol tests:
```bash
# Run library tests
cargo test --lib
# Run specific protocol tests
cargo test --test run_protocol_tests
# Run all tests
cargo test
```
## See Also
- [Bitcoin Integration Documentation](../bitcoin/)
- [Architecture Documentation](../architecture/)
- [API Reference](../api/)
- [Development Guide](../development/)
- [Security Documentation](../security/)