MindVault Mobile

React Native companion app for MindVault — browse payment-protected digital resources on Stellar.

Features

• Browse the public resource catalog
• Search by title
• Pull to refresh
• Copy resource access URLs
• On-chain registry count in the header

Prerequisites

• Node.js 18+
• npm or pnpm
• Expo Go on your phone, or Xcode / Android Studio for simulators

Setup

npm install

Point the app at your MindVault API server by editing app.json:

"extra": {
  "apiUrl": "http://localhost:4021",
  "networkPassphrase": "Test SDF Network ; September 2015"
}

Local Development Network Configuration

• Simulators/emulators (iOS/Android): localhost works fine, as they share the host machine's network stack
• Physical devices: Use your machine's LAN IP instead of localhost (e.g. http://192.168.1.10:4021), since the device can't reach the host's localhost directly

Find your LAN IP with:

• Windows: ipconfig (look for "IPv4 Address" under your active network adapter)
• macOS/Linux: ifconfig or ip a (look for "inet" address under your active network interface)

Publisher Authentication

Publisher resources require an API key for authentication:

• API Key Origin: Publisher API keys are issued by your MindVault backend server.
• Server Configuration: On self-hosted servers, configure your keys using the PUBLISHER_API_KEYS environment variable or generate one through your server's admin interface.
• App Usage: Enter the key in the Publisher Resources tab or Publisher Settings modal to view and manage your resources.

Stellar Network Configuration

The app defaults to the Stellar Testnet. The passphrase Test SDF Network ; September 2015 isn't a stale date — it's Stellar's official, fixed identifier for the public testnet, defined by the Stellar Development Foundation and unchanged since the network's launch. It's the same value as Networks.TESTNET in @stellar/stellar-base.

Where it's configured:

• app.json → expo.extra.networkPassphrase is the client-side default. It's read via Constants.expoConfig.extra.networkPassphrase in src/api/resources.ts and src/utils/stellarExpert.ts. To point the app at a different Stellar network, use one of the SDK's official passphrase strings (from @stellar/stellar-base's Networks constant):
  • Public Global Stellar Network ; September 2015 — mainnet
  • Test SDF Network ; September 2015 — testnet (current default)
  • Test SDF Future Network ; October 2022 — futurenet
• If this key is removed or left unset, the same value is still used as a hardcoded fallback in code — so the app always ends up on Testnet either way unless this key is explicitly changed.

One important exception: for transactions built through the register and price-edit flows (prepareRegister / prepareEditPrice in src/api/resources.ts), the passphrase used to sign is whatever the backend API returns in its response — the client's app.json value is only a fallback if the backend omits it. In practice, this means the network for those specific flows is ultimately a backend decision, not purely a client config one.

src/screens/DevSignerScreen.tsx is a developer-only debug screen and intentionally hardcodes Networks.TESTNET regardless of any config — it's not affected by the app.json value and always targets testnet.

Publisher Authentication

Publisher resources require an API key for authentication:

• API Key Origin: Publisher API keys are issued by your MindVault backend server.
• Server Configuration: On self-hosted servers, configure your keys using the PUBLISHER_API_KEYS environment variable or generate one through your server's admin interface.
• App Usage: Enter the key in the Publisher Resources tab or Publisher Settings modal to view and manage your resources.

Theme Preferences

The app supports light, dark, and system-synced themes, selectable from the Settings screen.

How persistence works: When you pick a theme, it's written to AsyncStorage under the key @mindvault_theme_mode via useTheme in src/theme/index.ts. On the next launch, the hook reads that key during its initial useEffect and restores your selection before the first render completes — so the chosen theme is active immediately on startup, with no flash.

Manual verification steps:

1. Open the app and go to Settings.
2. Select Dark (or Light) theme — the UI updates immediately.
3. Close the app fully (remove from recents).
4. Reopen — the same theme should be active without any flicker.
5. Select System to confirm it follows the device's OS-level setting.

If the stored value is missing or unrecognized, the hook silently falls back to System mode.

Run

npm start

Then press i for iOS simulator, a for Android emulator, or scan the QR code with Expo Go.

Available npm scripts

Script	Description
npm start	Start the Expo development server (supports Android, iOS, and web)
npm run android	Run the app on an Android device or emulator using Expo's development build
npm run ios	Run the app on an iOS device or simulator using Expo's development build
npm run web	Run the app in a web browser
npm run typecheck	Run TypeScript type checking without emitting files

Related

The main MindVault monorepo lives at ../mindvault and includes the server, web app, MCP server, and Soroban contracts.