MetroVault
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Documentation

Understand it before you trust it.

These guides ship with the source code and are published here for convenience. The canonical versions live in the repository.

Device Setup Guide

Turn a spare Android phone into a dedicated, air-gapped signing device — step by step, with the why behind every step.

Read

Security Model

The full security architecture: authentication, dual-layer encryption, rate limiting, and application-level protections.

Read

Seed Generation & Storage

How wallets are generated, stored, and used — BIP-39/BIP-32 derivation, entropy sources, and passphrases.

Read

Packaging MetroVault, or curious how the reproducible F-Droid pipeline works? See FDROID_BUILD.md on GitHub.

MetroVault

An air-gapped Bitcoin signing device for Android. Free software under GPL-3.0-or-later.

Product

FeaturesHow it worksSecurityvs. hardware walletsDownloadFAQ

Docs

Device Setup GuideSecurity ModelSeed GenerationReproducible Builds ↗

Project

GitHub ↗F-Droid ↗Releases ↗android-debloater ↗gorunjinian.com ↗

MetroVault is in active development. You are responsible for your own keys — keep proper mnemonic backups, verify addresses on the device screen, and test with small amounts first.

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