TASK 05

Use SeedSigner

Create a test seed, connect a watch-only wallet, and practice the QR signing loop.

You need

You’ll have

A watch-only wallet and a practiced offline signing workflow.

This is an operating walkthrough, not a claim that our untested carrier is ready to hold funds.

Create and back up a test seed

On the device: Tools → New seed (camera entropy or dice entropy). Choose the length and complete the prompts.
Record and verify the words offline. The ordinary SeedSigner flow holds the loaded seed in memory, so you need its backup again after power-off.
Use a disposable seed and an unfunded wallet for your first run. The website never asks you to enter a seed or PIN.

Open the loaded seed’s options and export an xpub for Single Sig and the script type you intend to use. Choose Sparrow as the QR format.
In Sparrow: create a new wallet, choose the air-gapped hardware wallet route, and scan the signer’s public export.
Keep network, derivation path and script type consistent. This is a watch-only wallet; never type the seed into Sparrow just to make scanning work.

Display a receive address in Sparrow and use the signer’s address-verification/scan flow to confirm it belongs to your loaded seed and wallet settings.
Compare the complete address and network. For multisig, import the correct wallet descriptor; a single cosigner seed alone does not define the wallet.
Do this before any real deposit. This prototype still needs its hardware validation.

Sparrow builds an unsigned transaction (PSBT) and displays it as an animated QR. Scan that QR with the signer.
On the signer, review destination addresses, amounts, change and fee before approving.
Display the signed QR, scan it back into Sparrow, then review there. Sparrow—not the offline signer—broadcasts when you explicitly choose to do so.

SparrowBuild unsigned PSBT

ShieldSignerReview & sign offline

SparrowReview & broadcast

Exit the loaded seed/session and power off when done. Retain a verified backup; an xpub or fingerprint cannot recover a lost seed.
A SeedQR encodes the secret, unlike a public wallet-export QR. Keep a printed SeedQR private just like the words.
For card storage or card signing, follow the separate smartcard task.

Sources & deeper reference

Checked 12 October 2026. Menu names can vary with firmware.