BiTchat is a native Swift messaging application for iOS and macOS that provides secure, decentralized communication over Bluetooth Low Energy (BLE) mesh, with optional Nostr and Tor transport. The codebase implements end-to-end encryption using the Noise protocol (XChaCha20-Poly1305), Ed25519 signatures, prekey forward secrecy, and a vouching trust model. It includes rotating peer IDs, fingerprint verification, recognition tags that avoid leaking social graphs, and panic-wipe capabilities. The app is structured around SwiftUI views, view models, and coordinators, with a central ChatTransportEventCoordinator routing inbound transport events (messages, noise payloads, delivery status, verification, peer lifecycle) to the UI layer.