# Bridge Comparison

## Comparison with Other Bridge Solutions

Libre CrossLink represents a significant advancement over existing Bitcoin bridging solutions, offering unique capabilities and advantages:

### CrossLink vs. Liquid Sidechain

| Feature                    | Libre CrossLink                    | Liquid                        |
| -------------------------- | ---------------------------------- | ----------------------------- |
| **Consensus Mechanism**    | Delegated Proof of Stake (DPoS)    | Federated Sidechain           |
| **Smart Contract Support** | Full Turing-complete WASM          | Limited (Simplicity language) |
| **Decentralization**       | Higher (permissionless validators) | Lower (federated model)       |
| **Vault Functionality**    | Individual segregated vaults       | No individual vaults          |
| **Programmability**        | Full smart contract integration    | Limited programmability       |
| **Speed**                  | \~1 second block times             | \~1 minute block times        |
| **Fee Structure**          | Transaction fee based              | Transaction fee based         |

Liquid is a federated sidechain requiring trust in a small federation of participants, whereas CrossLink uses threshold signatures across a broader set of permissionless validators, enhancing security and decentralization.

### CrossLink vs. THORchain

| Feature                         | Libre CrossLink                          | THORchain                 |
| ------------------------------- | ---------------------------------------- | ------------------------- |
| **Cryptographic Approach**      | MPC-TSS with smart contract coordination | Rotating TSS nodes        |
| **Primary Focus**               | Bitcoin-Libre bridge and BTC vaults      | Multi-chain DEX and swaps |
| **Smart Contract Capabilities** | Full Turing-complete environment         | Limited programmability   |
| **Individual Vaults**           | Yes, per-user vault addresses            | No individual vaults      |
| **Transaction Types**           | Bridge transfers and programmable vaults | Primarily token swaps     |
| **Fee Economics**               | BTC and USDT fees to validators          | RUNE-based economic model |
| **Collateral Architecture**     | Native BTC as collateral                 | Requires RUNE bonding     |

While THORchain also uses TSS technology, Libre CrossLink's integration with Libre's full Turing-complete smart contract platform enables significantly more complex and powerful DeFi applications. THORchain focuses primarily on cross-chain swaps, while CrossLink provides both bridging and advanced vault infrastructure.

### CrossLink's Unique Advantages

1. **Dual-purpose architecture** - Both a bridge and a vault system
2. **Full programmability** - Leverages Libre's complete WASM-based smart contract capabilities
3. **Segregated custody** - Individual vaults with complete asset separation
4. **Unwrapped BTC custody option** - Direct BTC collateralization without token wrapping
5. **Smart contract orchestration** - Bridge operations are governed by transparent smart contracts
6. **Multiple asset types** - Supports both wrapped BTC (Fast BTC) and unwrapped BTC in vaults

The most significant difference is CrossLink's integration with Libre's complete smart contract platform, allowing developers to build sophisticated financial applications on top of the bridge infrastructure using familiar languages like C++, TypeScript, Rust, and Go.