Summary of "Re{solve} Hackathon Workshop: Native Bitcoin support for Starknet dApps"
Summary of "Re{solve} Hackathon Workshop: Native Bitcoin support for Starknet dApps"
Key Technological Concepts and Features:
- Garden Finance Overview
- Garden Finance is a decentralized, trustless, and fast Bitcoin bridge enabling cross-chain swaps primarily between Bitcoin and Starknet.
- It supports atomic swaps using HTLCs (Hash Time Locked Contracts), enabling fully trustless cross-chain transactions without custody risks.
- Garden claims to be one of the fastest Bitcoin bridges with swap completion times as low as 30 seconds and nearing $2 billion in total volume.
- HTLCs Explained
- HTLCs are smart contracts that lock funds using two conditions:
- A secret (hashlock) that must be revealed to claim funds.
- A time lock allowing refund to the sender if the secret is not revealed within a specified time.
- This mechanism ensures atomicity: either the swap happens on both chains or neither does, preventing loss of funds.
- The swap process involves two parties (e.g., Alice and Bob) locking funds on their respective chains using the same secret hash, enabling secure cross-chain atomic swaps.
- HTLCs are smart contracts that lock funds using two conditions:
- Cross-chain Atomic Swaps
- Alice locks BTC on Bitcoin chain with a secret hash and time lock.
- Bob locks equivalent wrapped BTC (WBTC) on Starknet using the same secret hash.
- Alice redeems Bob’s locked funds by revealing the secret, which Bob then uses to redeem Alice’s BTC on Bitcoin chain.
- This process is fully trustless and decentralized.
- Garden API and Workflow
- Garden provides an API for developers to integrate Bitcoin-Starknet bridging into their dApps easily.
- Basic workflow with the API involves:
- Querying supported assets and pairs (e.g., BTC to WBTC).
- Getting a quote for the swap (amount and fiat value).
- Creating an order to register the swap intent.
- Initiating the order on the source chain.
- Automatic redemption handled by Garden’s backend.
- The API supports gasless redemption, meaning users do not pay gas fees directly for claiming funds.
- The secret hash is typically generated using the standard SHA-256 algorithm.
- Technical Details and Demo
- The workshop included a live demo using a TypeScript script that interacts with Garden’s API to perform a BTC to Starknet WBTC bridge.
- The demo transaction completed in approximately 21 seconds with negligible gas costs.
- The script is well-commented and available in a public repository for hackathon participants to use and build upon.
- Users need wallets on both chains (Bitcoin and Starknet) to participate in swaps.
- Approval of tokens is required on Starknet before locking funds in the HTLC contract.
- Additional Resources and Support
- Documentation for Garden Finance, including API references and HTLC concepts, is comprehensive and publicly available.
- Testnet environments and faucets are provided for safe experimentation.
- The workshop materials, recording, and all relevant links will be shared on the hackathon Telegram channel and the official hackathon webpage within 12 hours.
- Supported Chains and Assets
Main Speakers / Sources:
- Raan from Garden Finance — primary presenter explaining Garden’s technology, HTLCs, atomic swaps, API usage, and live demo.
- Dragon — host/moderator facilitating the workshop and Q&A.
- Additional participants included hackathon attendees asking questions and engaging during the session.
Summary of Reviews, Guides, or Tutorials:
- The workshop served as a technical tutorial on using Garden Finance’s decentralized Bitcoin bridge for Starknet dApps.
- It included a conceptual explanation of HTLCs and atomic swaps, a step-by-step guide to the Garden API workflow, and a live coding demo with a TypeScript script.
- Documentation and code repositories were promised and shared for further learning and hackathon development.
- The session encouraged participant questions and provided clarifications on cryptographic and operational details of cross-chain swaps.
Category
Technology
