SolanaSentinel: A Pre-Signature Firewall for Solana Agent Transactions on Devnet
A developer built SolanaSentinel during the MLH Solana Hackathon to inspect transaction instruction trees before an autonomous agent signs them on Solana Devnet. The tool lets users enter a plain-language swap intent and compiles the resulting multi-instruction bundle, including compute budget settings and a multi-DEX route. It flags risky payloads, such as unauthorized account-owner changes or spending beyond a daily cap, and halts the ephemeral signer before a signature is produced. The project also includes Solana Pay checkout links, Solana Actions endpoints, and a spoken security briefing generated with ElevenLabs and checked with Groq's Whisper transcription. The developer shared the source code, a live app, and a walkthrough video.
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