VaultChat — Encrypted Messenger on Nostr

Privacy-first P2P messenger: NIP-44 encryption, TURN-only voice, panic wipe.

by Wilhelm Kessler

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Jun 26, 2026 Communication

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VaultChat — Encrypted Messenger on Nostr

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VaultChat is a privacy-first Android messenger built on the Nostr protocol — not a wrapper around an existing chat SDK, but a system built and hardened from the ground up.Key features:NIP-44 v2 encryption (ECDH secp256k1 + ChaCha20 + HMAC-SHA256)TURN-only WebRTC voice calls — real IP of both parties never exposed, verified live with PCAPdroid + Wireshark packet capturesPanic Wipe (local) + VaultGuard companion app (remote wipe)Fake PIN / Decoy Mode for coercion-resistanceAES-256-GCM file encryption, Argon2id-encrypted backupsActivation-code system (Netlify Functions + PostgreSQL)VaultAdmin Flutter admin panel includedValidation: AI-assisted security audit at 9.5/10, cross-validated independently by a second AI auditor. Listed on awesome-nostr and Product Hunt. Full bilingual documentation package (architecture, build, IP declaration, audit report) included.Stack: Flutter/Dart, Nostr, WebRTC, coturn, Node.js, PostgreSQL, Netlify.What's included: Full source code (VaultChat + VaultGuard + VaultAdmin), complete documentation, infrastructure handoff guidance, post-sale support.Pre-revenue — sold as a mature, audited, working codebase. Estimated 12–18 months of full-time engineering work to rebuild from scratch.