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For the most careful setups, Parallax Wallet can keep your keys on a computer that never connects to the network. That computer, the offline signer, only signs. Your everyday computer runs the wallet with its node, follows the same accounts as watch-only, prepares each transfer, and broadcasts it once it’s signed. They pass transfers back and forth as QR codes, held up to each computer’s camera, or as files, so the signer never needs a network.

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What you need

  • A computer that will stay offline, with Parallax Wallet installed as an Offline signer. Install the app on it before taking it offline; it never checks for updates, so install new versions by hand.
  • Your everyday computer with Parallax Wallet and its node.
  • A camera on each, or a way to carry files between them, such as a USB stick.

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Set up

1

Make the offline computer a signer

At first launch choose Offline signer, or turn on Settings → General → Offline signer. It never starts a node, and it hides everything that needs the network.
2

Add your accounts on the signer

Create or import them there, as on any wallet; see Accounts.
3

Follow them from your everyday computer

On the signer, choose Show for watch-only next to an account to show its address as a QR code. On your everyday computer, add it with Settings → Accounts → Import accounts → Watch an address, and scan it.

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Send

1

Create a signing request

On your everyday computer, choose the watch-only account and Send as usual, then Create signing request. The app shows it as a QR code, and Save file… saves it. You can leave the page: the request waits on the Overview until it’s signed.
2

Sign it offline

On the signer, choose Scan a signing request, then scan the QR code or open the file. Check that the fingerprint matches the one your everyday computer shows, and that the amount and the recipient are what you meant to send. Then Sign.
3

Broadcast it

The signer shows the signed transaction as a QR code, or saves it as a file. On your everyday computer, Scan signed transaction (or Broadcast in the sidebar) and send it to the network.
Broadcast also takes a raw signed transaction from the parallax-wallet command-line tool.

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Good to know

  • Only plain LAX transfers can be signed offline.
  • Fee cap in Settings → General on the signer is the most fee a signed transfer may pay; a request above it is refused.
  • If the signer has already signed a different transfer from the same account with the same nonce, it warns you: only one of them can go through.
  • To call off a request that’s waiting, choose Cancel with a replacement on the Overview: it makes a new request that sends 0 LAX back to the account, which you sign and broadcast like any other. Discard only stops the wallet following it.
  • Sign message works the same way for watch-only accounts: the request goes to the signer as a QR code.