etfusion

This project extends 1inch's Fusion+ protocol to enable bidirectional token swaps between Ethereum and Tron, preserving hashlock and timelock functionality for secure, atomic cross-chain swaps.

Core Innovation:

• First Fusion+ extension to non-EVM chain (Tron)
• Dual-chain architecture: Hardhat (Ethereum) + TronWeb (Tron)
• Cross-chain resolver coordinates both chains seamlessly
• Preserves all Fusion+ security features (hashlocks, timelocks, partial fills)

Hackathon Requirements Met: ✅ Hashlock and timelock functionality preserved for non-EVM (Tron) implementation ✅ Bidirectional swap capability (ETH ↔ TRX) ✅ On-chain execution demonstrated on testnets (Sepolia + Nile) ✅ Partial fills supported via Merkle tree secrets

Technical Architecture:

• Ethereum Side: Uses 1inch LOP on Sepolia testnet
• Tron Side: Custom HTLC contracts on Nile testnet
• Cross-Chain Resolver: Node.js script coordinating both chains
• Fusion+ Integration: SDK for order creation and WebSocket monitoring

Demo Flow:

1. User creates ETH→TRX swap via 1inch Fusion+ SDK
2. Resolver deploys escrows on both chains with same hashlock/timelock
3. Atomic swap executes: secret revealed on both chains simultaneously
4. On-chain verification via block explorers

This demonstrates the first successful extension of 1inch Fusion+ to a non-EVM blockchain while maintaining all security guarantees and enabling true cross-chain interoperability.

Technology Stack:

• Smart Contracts: Solidity 0.8.19 (Ethereum) + Solidity (Tron)
• Development: Hardhat (Ethereum) + TronWeb (Tron)
• Cross-Chain: Node.js resolver with 1inch Fusion+ SDK
• Testing: Comprehensive test suite with Chai/Mocha

Key Technical Components:

1. Dual-Chain Architecture:

   • Ethereum: Hardhat + ethers.js + 1inch LOP
   • Tron: TronWeb + custom HTLC contracts
   • Cross-chain coordination via Node.js resolver

2. Fusion+ Integration:

   • 1inch Fusion+ SDK for order creation and monitoring
   • WebSocket API for real-time order tracking
   • Merkle tree secrets for partial fills support

3. Smart Contract Innovation:

   • EthereumEscrowFactory.sol: Deploys escrows on Sepolia
   • TronEscrowFactory.sol: Deploys escrows on Nile
   • Both implement identical HTLC logic with SHA-256 hashlocks

4. Cross-Chain Resolver:

   • Monitors 1inch Fusion+ orders via WebSocket
   • Deploys corresponding escrows on both chains
   • Coordinates secret submission for atomic swaps
   • Handles partial fills and error recovery

Hacky Solutions:

• Used Gnosis as proxy destination for Tron in 1inch SDK (since Tron not natively supported)
• Implemented custom TronWeb integration for non-EVM chain
• Created dual deployment system: Hardhat for Ethereum, TronWeb for Tron
• Built cross-chain secret coordination mechanism

Partner Technologies:

• 1inch Fusion+ SDK: Leveraged for order creation and monitoring
• TronWeb: Used for Tron blockchain interaction
• Hardhat: Ethereum development and testing framework

Security Features:

• SHA-256 hashlocks on both chains
• Timelock-based cancellation
• Reentrancy protection
• Comprehensive error handling
• Atomic swap guarantees

The project successfully extends 1inch's Fusion+ protocol to Tron while maintaining all security properties and enabling true cross-chain interoperability between EVM and non-EVM chains.