BTC Testnet4 and Tailscale - BYOB Wallet Integration

General Discussions
1

Hey everyone,

I’m working on a small Android wallet called BYOB Wallet, built specifically for Bitcoin education workshops and designed to work cleanly with Umbrel nodes.

It’s a minimal, session-only wallet with nothing saved to the device, and everything resets when you close the app. The goal isn’t to be a daily wallet, but a teaching tool that helps people understand how self sovereign PSBT transactions actually work.

What the app does:

Watch-only, ephemeral sessions (no persistence)

Builds PSBTs and signs via SeedSigner using QR codes

Supports mainnet and testnet4

Color-coded UI (orange = mainnet, blue = testnet)

Simple transaction breakdowns for learning

Umbrel setup:

  1. App connects to Electrs on Umbrel using configuration screen

  2. App uses Tailscale instead of Tor as it is faster, more reliable and easier for beginners

I have an early working prototype that handles network selection, wallet setup via QR, transaction building, and node connections.

Here’s a link to the wallet app: https://byob-sign-go.base44.app

The Membership Card qr code needs to contain a valid z/y/xpub address for mainnet or a tpub address for testnet.

I’d love help from someone who:

  • Runs an Umbrel node
  • Uses or is comfortable setting up Testnet4 on their node
  • Uses or is comfortable setting up Tailscale on their node
  • Willing to test app software
  • Bonus if you have a SeedSigner

Testing would mostly be connecting to your node, building testnet transactions, and giving feedback on UX and reliability.

If this sounds interesting, reply here or DM me.

Thanks

1 Like
Public Pool app - testnet4
2

UPDATE

(The Membership Card qr code needs to contain a valid z/y/xpub address for mainnet or a tpub address for testnet - current version shows demo wallet only)

Just added node configuration functionality to the app. Not tested

If you run an Umbrel with Bitcoin Node and are comfortable to configure Testnet4 network, install Electrs, would consider adding Tailscale and would be willing to help test the app software please get in touch :folded_hands:

Bonus if you have a SeedSigner

I am keen to continue with this project and would like to test connecting to a node, building testnet transactions, and getting feedback on UX and reliability.