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3. Bitcoin PSBT Transaction Builder — coin selection, fee/change optimization, and BIP-174 PSBT generation with an interactive web UI. Built for Summer of Bitcoin 2026.

   Rust

4. Bitcoin Chain Analysis Engine — applies heuristics (CIOH, change detection, CoinJoin detection, etc.) to real block data with an interactive Next.js dashboard. Built for Summer of Bitcoin 2026.

   TypeScript