SeedSigner represents one of the purest expressions of bitcoin self-custody. It is open-source, air-gapped, and stateless. Unlike traditional hardware wallets, it does not store your seed internally. Instead, you can recreate your keys for each session by scanning a QR code or re-entering your seed words. This design minimizes attack surfaces, maximizes transparency, and gives you complete confidence in the integrity of your setup.

Setting Up SeedSigner

Using SeedSigner is more straightforward than it may appear. You begin by either generating or importing a seed phrase directly on the device. If you already have a wallet, you can temporarily input your seed phrase to use SeedSigner for signing. If not, you can create a new one using dice rolls or photo entropy, ensuring that your keys are born entirely offline.

Building and Signing Transactions

Once you have a seed, you build a transaction using wallet software such as Sparrow or Specter. That unsigned transaction is displayed as a QR code on your computer or phone. You then scan it with SeedSigner’s built-in camera. The device presents the transaction details—recipient address, amount, and fees—so you can verify everything for yourself. After you confirm, SeedSigner signs the transaction offline.

Broadcasting Securely

The signed transaction is displayed as a new QR code, which you scan back into your wallet software. From there, it can be broadcast to the Bitcoin network. At no point does SeedSigner connect to Wi-Fi, Bluetooth, or the internet. The entire process remains air-gapped, auditable, and fully under your control.

Open-Source Transparency

Perhaps SeedSigner’s greatest advantage is transparency. Built from inexpensive components like a Raspberry Pi Zero and a small camera, it is open-source both in hardware and software. Anyone can audit the code or even build the device themselves. This eliminates reliance on supply chains and manufacturers, aligning perfectly with Bitcoin’s ethos: don’t trust—verify.

Why Choose SeedSigner?

For those seeking sovereignty without compromise, SeedSigner is a tool of choice. It embodies the principle of true ownership: open, verifiable, and completely offline. In SeedSigner, the ethos of Bitcoin comes to life.