Bitcoin-only. Self-custody.

Your keys,
your Bitcoin.

A watch-only wallet to track your portfolio and an air-gapped signer to keep your keys truly offline. No servers. No accounts. No compromises.

App Store

Watch-only wallet

Your Bitcoin portfolio in real-time

Import your extended public key and monitor your balance, track transactions, and manage addresses without ever exposing your private keys. Perfect for daily use on your connected device.

Watch-only wallet showing balance and transaction history

Offline signer

Security you can trust

Turn any spare phone into a hardware wallet. Your private keys never touch the internet. Sign transactions via QR code exchange with your watch-only device, keeping your seeds fully air-gapped.

Made for daily usage

Receive BTC anywhere

Generate fresh receiving addresses with a tap. Share via QR code or text. Automatic gap-limit scanning ensures you never miss a payment, even with multiple wallets.

Keep assets safe

Send it securely

Build transactions on your watch-only wallet, sign them offline on your signer, and broadcast without your keys ever going online. Full PSBT support, real-time fee estimation, and address book included.

Built for Bitcoiners

Everything you need to self-custody your Bitcoin with confidence.

Air-gapped signing

Your private keys never touch the internet. Sign transactions offline via animated QR codes using PSBT and BBQr protocols.

Watch-only mode

Track balances and transactions using just your xpub. No private keys required on your connected device.

Multisig support

Set up multi-signature wallets for enhanced security. Supports sorted-multi descriptors with 2-of-3 and beyond.

Encrypted storage

Seeds encrypted with Argon2id + AES-256-GCM. Protected by PIN, biometrics, and OS-level secure storage.

Full descriptor support

Import wallets via output descriptors or extended public keys. Supports P2WPKH, P2PKH, P2SH-P2WPKH, and Taproot.

No servers, no accounts

Connects directly to public Electrum APIs. No registration, no tracking, no third-party servers holding your data.

How it works

Two devices, one secure workflow.

Set up your signer offline

Put a spare phone in airplane mode. Import or generate a BIP39 seed phrase. This device will never connect to the internet again.

Export your xpub

Use the signer to display your extended public key as a QR code. Scan it from your daily phone to create a watch-only wallet.

Monitor and transact

Track your balance and receive Bitcoin on your watch-only device. When you need to send, build the transaction there.

Sign and broadcast

Scan the unsigned transaction QR on your offline signer, review and sign it, then scan the signed result back to broadcast.

Your keys,your Bitcoin.