Bull Bitcoin + Specter DIY

The original Bull Bitcoin app alongside the Specter DIY firmware. Exchange QR codes and files between both devices.

TESTNET SIMULATOR. Never enter a real seed or use real funds. Mnemonic import uses Bull Bitcoin’s secure on-screen keyboard; paste is disabled. Use only a disposable test phrase. Bull Bitcoin’s disposable wallet and PIN are stored in this browser tab only. Physical hardware, Tor, biometrics, background tasks, Boltz swaps and Payjoin OHTTP are unavailable in this browser port.

Bull Bitcoin

The original Bull Bitcoin wallet app.

Browser

9:41SIMULATOR ▴ ▣

Starting the Bull Bitcoin app…

Specter DIY

Real Specter DIY firmware in the existing WebAssembly simulator.

Starting

Browser compatibility and source

The embedded app runs Bull Bitcoin upstream commit 98eb380f74a507ce1bcb6848bd2d77cf46959f9e from its canonical develop branch. Its original Flutter screens, BLoC, GoRouter, Drift database, wallet repositories and QR parser run in the browser. The pinned native BDK and LWK Rust wallet APIs are compiled to WebAssembly. Browser adapters provide session storage, SQLite, HTTPS transport, file dialogs and QR peripherals. MIT license · third-party notices.

A fresh/reset Bull session defaults to Bitcoin Testnet3 and Liquid Testnet. Saved network choices are preserved. Blockchain synchronization uses Blockstream’s public HTTPS Esplora APIs; queried scripts and broadcast transactions are shared with that service. Custom Electrum TCP servers and Tor require a native app. QR frames pass through both applications’ original parsers. Each device has its own reset.