Mar 19
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PolkaSentinel is the first on-chain transaction guardian that detects and blocks DeFi exploits in real-time — with zero off-chain dependency. 🛡️ What it does: • Collects 10 real-time features from every transaction • Runs a decision tree classifier entirely on-chain • Automatically blocks reentrancy attacks, vault drains, and suspicious patterns • Any protocol integrates with 3 lines of code ⚡ Live Demo: • Same reentrancy attack against two vaults • Unprotected vault: DRAINED (9 → 5 ETH) • Protected vault: SAFE (9 → 9 ETH) • All transactions verified on Polkadot Hub TestNet 🔗 Links: • Live App: https://polka-sentinel.vercel.app • GitHub: https://github.com/h30s/PolkaSentinel • Track: PVM Smart Contracts (Track 2) 📊 Stats: • 4 contracts deployed on Polkadot Hub TestNet (Chain ID: 420420417) • 30 Solidity tests + 15 Rust tests — all passing • 7 verified testnet transactions with real tx hashes • Built with OpenZeppelin (Pausable, AccessControl, ReentrancyGuard) 🏗️ Tech Stack: • Solidity 0.8.24 + OpenZeppelin • Rust (PVM-ready decision tree engine) • React 18 + Vite + TailwindCSS • Hardhat + ethers.js v6 Built for the Polkadot Solidity Hackathon 2026 $3B lost to DeFi exploits. PolkaSentinel puts security on-chain. #Polkadot #DeFi #Hackathon #SmartContracts #Solidity #Rust #PolkaVM #Web3 #BlockchainSecurity #OpenZeppelin