Description
The Blockstream JadeLink is a premium, low-profile 64GB USB-C storage drive built for one job: keeping your Blockstream Jade Plus completely air-gapped. It measures 32mm x 15mm x 8mm, weighs 7 grams, and its metal body matches the Jade Plus Lunar Silver finish.
With JadeLink, you install firmware updates and sign Bitcoin transactions with zero USB data connection to a computer and zero Bluetooth. Per Blockstream’s official documentation, JadeLink combined with the Jade Plus camera covers every Jade Plus function in a fully air-gapped workflow, including device unlock and receive address verification.
Two Jobs, Zero Attack Surface
An air gap means your signing device never opens a data channel to a networked machine. No USB data connection, no Bluetooth pairing, no wireless attack surface. You control exactly which files reach your hardware wallet, and nothing else gets through.
The Jade Plus already signs transactions air-gapped by QR code using its GC0308 camera. JadeLink completes the picture with air-gapped file transfer, which handles the two things QR codes cannot do well:
- Air-gapped firmware updates. Firmware binaries are far too large to move by QR code. JadeLink is the only fully air-gapped way to keep your Jade Plus firmware current. Blockstream notes this method is both faster and more secure because it limits remote attack vectors.
- Reliable large-transaction signing. Complex or multi-input PSBTs that would require long animated QR scans transfer instantly as files. Save the unsigned transaction from Sparrow Wallet, Electrum, Nunchuk, or the Blockstream app, sign offline, broadcast when you choose.
Blockstream JadeLink Technical Specifications
All specifications below are confirmed against Blockstream’s official product documentation:
| Specification | Blockstream JadeLink |
|---|---|
| Capacity | 64GB |
| Connector | USB Type-C |
| Material | Metal |
| Dimensions | 32mm x 15mm x 8mm |
| Weight | 7g |
| Compatibility | Blockstream Jade Plus |
| Supported functions | Air-gapped firmware upgrades, PSBT transaction signing, device unlock, receive address verification (with Jade Plus camera) |
The Air-Gapped Signing Workflow, Step by Step
This is the exact process from Blockstream’s Help Center, demonstrated there with Sparrow Wallet. The full round trip takes about two minutes:
- Create the transaction. In your companion app, enter the recipient address and amount. The app produces an unsigned PSBT file containing transaction data and no secrets.
- Save it to JadeLink. Choose to save the unsigned transaction to JadeLink, then eject the drive. The file is safe even if intercepted because it contains no signatures.
- Sign on the Jade Plus. Connect JadeLink to your Jade Plus, open an air-gapped session, and select Options, then USB Storage, then Sign. Pick your PSBT file, verify the recipient address and amount on the device screen, and confirm.
- Jade Plus writes the signed transaction back to JadeLink. After you confirm, the device saves the signed transaction as a file directly to the drive. Your private keys never leave the Jade Plus.
- Broadcast. Reconnect JadeLink to your online device. Your companion app reads the signed file and broadcasts it to the Bitcoin network.
Firmware Updates in Seconds, Fully Offline
Blockstream’s documented firmware procedure is just as simple. Download the firmware .bin and .hash files from the official Jade firmware upgrade page, copy both to JadeLink, and eject. One detail Blockstream flags that most buyers miss: the filenames must stay exactly as downloaded. A duplicate with a trailing (1) will not be recognized by the Jade Plus.
Connect JadeLink to your Jade Plus, unlock the device, and select Options, then USB Storage, then Firmware Upgrade. Choose the binary, review the firmware details on screen, and confirm. The Jade Plus verifies Blockstream’s cryptographic signature before installing, completes the update in seconds, and reboots. Your device never touches a computer, which eliminates an entire class of supply chain and malware attacks during updates.
JadeLink vs. a Generic USB Drive: The Honest Comparison
Full transparency: Blockstream’s Help Center confirms that most generic FAT32-formatted USB drives and SD cards can perform these same functions. No other retailer selling this product tells you that. We do, because trust is the entire point of self-custody hardware.
The same Blockstream documentation then makes the case for us: Blockstream recommends using JadeLink over generic drives “to avoid potential compatibility issues or security threats.” Here is what that means in practice:
- Verified supply chain. A marketplace USB stick has an unknown firmware history. JadeLink arrives sealed, direct from Blockstream, through a verified seller. For hardware that plugs into your signing device, provenance is the security feature.
- Guaranteed compatibility. It works out of the box. No FAT32 reformatting, no partition troubleshooting in the middle of moving funds.
- Purpose-built fit. The low-profile metal body plugs flush into the Jade Plus USB-C port with no adapter, no cable, and no stress on the port.
- Dedicated single-use device. Best practice is a drive that only ever touches your signing workflow. At this price, there is no reason to reuse the family photo stick on the device guarding your Bitcoin.
Sourced Directly From Blockstream, Shipped Same Day From Houston
- Same-day shipping from Houston, Texas. Orders leave our warehouse the day you place them, with tracking, to 70+ countries.
- Verified Blockstream seller. Sealed retail packaging, sourced directly from Blockstream. No marketplace roulette, no unknown third-party drives.
- Human support. Our small team has shipped 50,000+ devices since May 2024 and answers setup questions ourselves.
- Pay your way. Card or bitcoin. Review our warranty, refunds, and returns policy before you buy.
