Blockstream Jade Plus: Airgapped Desktop Setup, QR Codes, and Jade Link Guide

Why Airgapped Desktop is "Hard Mode"

Using the Jade Plus over Bluetooth or direct USB is remarkably straightforward because the companion app handles the blind oracle communication automatically in the background. However, when you operate strictly airgapped on a desktop computer, you must manually complete an optical handshake with the Blind Oracle at the start of each session before your keys can be decrypted into temporary memory.

While this adds an extra step to your workflow, it gives you a transparent, fully verifiable security model without closed-source chip vendor trust.

Unboxing & Hardware Overview

When unboxing the Blockstream Jade Plus, ensure the anti-tamper sticker on the packaging is intact. Inside the box, you will find:

• The Jade Plus Device: Features a rear-facing camera for scanning QR codes, a color display, top navigation buttons, and an enter button.
• USB-C Cable: Used for power and optional direct connection.
• Recovery Sheets & SeedQR Templates: Compact templates for recording 12-word or 24-word seed phrases or hand-drawing SeedQR grids for stateless usage.
• Jade Link USB Drive: A compact dual-interface USB drive accessory for physical file-based PSBT airgapped signing.

Step 1: Generating a New Wallet

Power on the device by holding down the bottom power button. You will see the initial firmware version, the unique device ID (e.g., Jade BD8C24), and confirmation that Bluetooth is disabled.

1. Navigate to Setup Jade and select Continue.
2. Select Begin Setup > Create New Wallet. (If you want a 24-word seed phrase, select Advanced Setup instead. For standard setups, 12 words provide robust 128-bit entropy).
3. Write down the 12 words in order (top-down, left-to-right) on your physical recovery sheet. Never store these digitally or take photos of them.
4. Confirm the requested words (e.g., word 2 and word 4) using the top navigation buttons to cycle through the BIP39 dictionary and press Enter.

Step 2: Airgapped PIN Setup & Oracle Handshake

Next, the device asks how you want to connect. Choose the QR Method to keep the device fully airgapped.

1. On your computer or smartphone browser, navigate to the official PIN setup portal: blstrm.com/pn.
2. Enter a strong, memorable numeric PIN. Your PIN is a vital component of the encryption key, so make sure you write it down securely.
3. The web page will present a QR code representing the Blind Oracle challenge.
4. On your Jade Plus, the camera will activate. Point the Jade camera at your computer screen to scan the QR code.
5. The Jade calculates its response and displays a new QR code on its own screen.
6. Use your computer webcam (or phone camera on the webpage) to scan the QR code displayed on the Jade.
7. Once verified, the Jade screen will update to display Active at the bottom. Your wallet is now initialized and ready for signing!

Step 3: Pairing Jade Plus with Sparrow Desktop

Now that the wallet is active, you can export your extended public key (xpub) into Sparrow Wallet to create a watch-only coordinator wallet.

1. Open Sparrow Wallet on your computer, go to File > New Wallet, and name it (e.g., "Jade Plus Airgap").
2. Select Airgapped / QR or click on the Jade icon under Connected Hardware Wallets.
3. On your Jade Plus, go to Options > Wallet > Export Xpub. Select your script type (Native SegWit / Taproot) to display the xpub QR code.
4. In Sparrow, click Scan next to the camera icon and present the Jade's screen to your computer webcam.
5. Verify Master Fingerprint: On your Jade, go to Settings > Master Fingerprint and confirm that the 8-character hex code matches the Master Fingerprint shown in Sparrow. (Note: If you use a BIP39 passphrase, the fingerprint will be different).
6. Click Apply in Sparrow to save your wallet.

Step 4: Airgapped QR Code Sending & Receiving

To verify full bidirectional communication, let us execute a test receive and spend transaction using animated QR codes.

Receiving Bitcoin

In Sparrow, navigate to the Receive tab. Copy the address to send a small amount of test satoshis from another wallet. Once broadcast, the transaction will appear in Sparrow's mempool transaction history.

Signing and Sending via QR Codes

1. In Sparrow, go to the Send tab, paste the destination address, set your amount, and choose a mining fee rate.
2. Click Create Transaction, review the outputs, and click Finalize Transaction for Signing.
3. Click the Show QR button on the bottom left in Sparrow. This displays an animated Partially Signed Bitcoin Transaction (PSBT) QR code.
4. On the Jade main menu, select Scan QR Code to activate the camera and scan the animated QR code on your computer monitor.
5. The Jade displays the destination address, the amount, and the transaction fee. Thoroughly verify every detail on the trusted device screen, scroll down to the checkmark, and press Enter to sign.
6. The Jade now displays the signed transaction as an animated QR code.
7. In Sparrow, click Scan QR and hold the Jade in front of your webcam. Sparrow reads the signature and allows you to click Broadcast Transaction.

Method 2: Airgapped PSBT Signing with Jade Link

If your computer lacks a webcam or you prefer moving files over physical media, you can use the Jade Link USB Drive accessory.

1. Create and finalize your transaction in Sparrow as before.
2. Instead of displaying a QR code, click Save Transaction and save the .psbt file directly to the Jade Link drive mounted on your computer.
3. Unplug the Jade Link from your computer and insert it into the USB-C port of your Jade Plus.
4. On the Jade, navigate to Options > USB Storage > Sign.
5. Select the candidate PSBT file on the drive, review the transaction details, and confirm signing. The Jade automatically writes a new signed file (e.g., filename-signed.psbt) to the drive.
6. Unplug the Jade Link, connect it back to your computer, and in Sparrow click Load Transaction. Select the signed file and broadcast it to the network.

Important Windows Fix: Formatting Jade Link with Rufus

If you are setting this up on a Windows PC, you might encounter an annoying bug where the Jade Plus refuses to read the Jade Link USB drive.

By default, the Jade Link ships formatted in exFAT. Windows' built-in formatting utility only allows drives over 32GB to be formatted as NTFS or exFAT, but the Jade operating system requires FAT32.

1. Download the free, open-source tool Rufus.
2. Insert your Jade Link drive into your PC and launch Rufus.
3. Under Boot selection, choose Non bootable.
4. Under File system, select Large FAT32.
5. Click Start to format the drive. Once formatted, the Jade Plus will read and write PSBT files without any issues. (Mac and Linux users can format to FAT32 natively without third-party tools).

Final Verdict & Multisig Value

The Blockstream Jade Plus provides a compelling blend of open-source transparency, affordable hardware, and flexible signing modes. The absence of a physical secure element is a deliberate design trade-off: it eliminates the risk of closed-source hardware backdoors, relying instead on the Blind Oracle model.

While airgapped desktop use requires extra manual steps compared to mobile or direct USB connections, the Jade Plus truly shines when paired with other hardware signers (like Coldcard, Keystone, or Passport) in a multi-vendor multisig quorum. In that architecture, any single hardware compromise or blind oracle dependency cannot put your Bitcoin at risk.