ThunderPortal

Problem Statement

Thunder Portal enables trustless atomic swaps between Bitcoin and Ethereum without bridges or wrapped tokens. We extended 1inch Fusion+ protocol to support native Bitcoin through a custom HTLC service written in Rust.Key features:True atomic swaps with cryptographic guaranteesNo intermediary tokens or bridges requiredReal testnet transactions on Bitcoin testnet3 and Ethereum SepoliaOrder chunking for improved liquidity matchingCLI demo and live testnet swap functionalityOur solution solves the trust problem in cross-chain swaps by using Hash Time Locked Contracts (HTLCs) on both chains, ensuring either both transactions complete or neither does.

Solution

Thunder Portal consists of three main components:Bitcoin HTLC Service (Rust): Custom service that creates and manages Bitcoin HTLCs, handles script generation, and monitors the Bitcoin testnet3 network.Ethereum Smart Contracts (Solidity): Factory pattern for deploying escrow contracts that implement HTLC logic on Ethereum Sepolia.Thunder Portal CLI (TypeScript): Orchestrates the atomic swap process, manages order chunking, and provides user interface.We extended the 1inch Fusion+ architecture by adding Bitcoin support through our HTLC service. The system ensures atomicity by using the same preimage hash on both chains - revealing the preimage claims both sides of the swap simultaneously.Notable technical achievements:Real Bitcoin script generation for HTLCsAtomic guarantee without trusted intermediariesLive testnet deployment with verifiable transactions