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// THE AIR-GAPPED BITCOIN ECOSYSTEM

One Signer.
Every Device.
Total Sovereignty.

Download the SeedSigner Desktop application and take command of the entire SeedSigner ecosystem — air-gapped transaction signing, multisig coordination, and QR-based verification, all from one command center.

Download for Desktop Get the Browser Extension

Open-Source Stateless Air-Gapped Verifiable Builds < $50 to build the signer

// GET THE SOFTWARE

Download the SeedSigner Desktop App

One command center for your whole signing setup. Free, open-source, and verifiable — pick your platform below.

Every release is GPG-signed. Verify before you trust.

Chrome
Web Store · v1.4.2
Firefox
Add-ons · v1.4.2
Brave
Web Store · v1.4.2

Pair your extension with the Desktop app to preview and co-sign transactions across the whole ecosystem.

// THE INTERFACE

What the Desktop & Extension Look Like

Dark, focused, and built for verification. Every screen keeps your keys exactly where they belong — offline.

DESKTOP — Pixel-faithful recreation — built entirely in CSS.
EXTENSION — Pixel-faithful recreation — built entirely in CSS.

// WHY IT MATTERS

Transactions That Never Touch the Internet

Every byte of the signing flow moves through light and lenses — QR in, QR out. Nothing else.

0 bytes online

Your keys never touch the internet. Sign fully air-gapped.

PSBT-native

Parse, review, and sign partially signed Bitcoin transactions via animated QR codes.

Multisig, simplified

Coordinate xpubs and sign multi-sig wallets with a guided interface.

SeedQR fast-pass

Scan your SeedQR and be signing in seconds, word-perfect.

Address verification

On-demand receive/change address checks before every send.

BIP85 derived

Derive child seeds and infinite wallets from a single master seed.

LIVE — AIR-GAP SIGNING LOG /dev/qr0 · 115200 baud

Works with your favorite coordinators:

Specter Desktop Sparrow Wallet BlueWallet Nunchuk Keeper Bull Wallet

Your keys. Your coins.
Your signer.

Free and open-source, forever. No accounts, no tracking, no trusted third parties.

Download Now — Free & Open Source