Bitcoin 2025 Hackathon - Las Vegas
Winner announcement for the Rebar Shield × Alkanes Challenge at Bitcoin 2025. @TangataNui's Acai smart contract recieved the win with MEV protection, demonstrating RBF-resistant Bitcoin applications.
WINNER ANNOUNCED!
@TangataNui wins the Rebar Shield × Alkanes Challenge!
Prize: $4,250 in $BTC + 200 $DIESEL
Sponsors: Rebar Labs & @oylwallet
Event: @TheBitcoinConf Hackathon Challenge
Acai: Revolutionary Bitcoin Smart Contract
Acai is the first RBF-resistant WASM smart contract on Alkanes and Bitcoin Layer 1
Operational on fartane.com (by @Fartanium)
Key Metrics
300+ Successful Mint Transactions
May 14-18
0 Non-Standard Transaction Requirements
Full Bitcoin Core Compatibility
100% Success Rate with Rebar Shield
vs 14-20% without protection
Watch the Demo
See Acai in action with Rebar Shield protection
Thank You to Our Partners
Special thanks to all @TheBitcoinConf online hackathon participants and fellow industry sponsors:
Follow the Full Story
Winner Announcement
View original tweet from @RebarLabs
Technical Details
@TangataNui explaining Acai's technical implementation
View tweet
Celebration
@RebarLabs celebrating the achievement
View tweet
Build on Bitcoin
The Acai smart contract demonstrates the power of combining Alkanes smart contracts with Rebar Shield MEV protection. This winning implementation shows how developers can create RBF-resistant applications on Bitcoin Layer 1, opening new possibilities for decentralized applications.
Technical Innovation
- First RBF-resistant WASM smart contract on Bitcoin
- Leverages Rebar Shield for transaction protection
- Full compatibility with Bitcoin Core
- No non-standard transaction requirements
Impact
- Proves viability of MEV protection for Bitcoin smart contracts
- Demonstrates practical use case for private mempool routing
- Sets precedent for future Bitcoin application development
- Shows path forward for RBF-resistant applications
About the Challenge: The Rebar Shield × Alkanes Challenge at The Bitcoin Conference hackathon invited developers to build innovative solutions leveraging Rebar Shield's MEV protection capabilities with Alkanes smart contracts.
About Rebar Shield: A Bitcoin MEV protection service that routes transactions directly to mining pools, bypassing the public mempool to prevent front-running and other MEV attacks.
About Alkanes: A smart contract platform for Bitcoin that enables WASM-based programmable transactions on the Bitcoin blockchain.