Keystone 3 Pro

The Keystone 3 Pro is a hardware wallet built around air-gapped signing: transactions move between the device and your software wallet as QR codes rather than over a cable or radio. It has a 4-inch LCD touchscreen (480 x 800), a fingerprint sensor, a 1000 mAh lithium-ion battery and a USB-C port, and it measures 62.44 x 103.9 x 12.08 mm at 103 g. It was listed at $149 on Keystone’s shop on 14 October 2026; a microSD card is not included at that price.

What does air-gapped mean on the Keystone 3 Pro?

During air-gapped operation, the wallet exchanges transaction data without a direct cable or wireless data connection to the computer or phone that talks to the blockchain. Keystone’s explainer on air-gapped wallets describes the flow in five steps:

1. Your online software wallet creates the transaction request.
2. You transfer it to the Keystone “using a QR code or memory card.”
3. The Keystone signs the transaction.
4. You transfer the approved transaction back to the online wallet.
5. The software wallet broadcasts it.

The private key stays on the Keystone throughout; only the request and the signed result cross the gap. Keystone’s Bitcoin-only page describes this as “Camera Transaction through QR code”: the Keystone scans codes with its own camera and shows its replies on its screen for your phone or computer to scan. Keystone’s product page says it “employs QR codes and Micro SD cards for offline data transfer,” and the Bitcoin-only page describes Air-gap Mode as “No Bluetooth No NFC No WIFI.”

Air-gap Mode is a setting, not a missing port. The same product page’s FAQ says that to update firmware over WebUSB you must first disable Air-Gap Mode in Device Settings, so the USB-C port can carry data when you allow it. To connect a software wallet, your computer or phone needs a camera to read the Keystone’s QR code.

For how QR, microSD and USB signing compare across devices, see our air-gapped hardware wallets guide.

Who is the Keystone 3 Pro for?

It suits people who:

• want no cable or wireless link to an online device during signing;
• use MetaMask or other third-party wallets and want to read full transaction details on a large screen before approving;
• hold bitcoin and want Bitcoin multisig or a Bitcoin-only firmware option.

It suits less well if you want a small, battery-free device: at 103 g and 62.44 x 103.9 mm, it has a battery to keep charged. Other QR-capable signers in our database include the Coldcard Q, the Blockstream Jade Plus and the OneKey Pro.

Is the Keystone 3 Pro secure and open source?

Keystone says the 3 Pro carries “three security chips.” Its product page does not name them; a 2023 Keystone blog post names three chips for the Keystone 3 line: an ATECC608B and a DS28S60 that together protect the stored seed, and a MAX32520 that handles fingerprint data on the Pro. Keystone also describes anti-tamper protection that wipes internal data if the device is opened, and a device verification step against supply-chain tampering.

On open source, Keystone states that “All of our code, including both hardware and software, is made open source.” That is the maker’s claim: our dataset did not independently check the licence or whether the published code builds to the firmware shipped on devices.

How do Keystone backup and recovery work?

Keystone supports two backup formats:

• A standard recovery phrase. The product page describes the passphrase as an extra “25th word” added “to the standard 24-word recovery phrase.” Our dataset did not verify which phrase lengths the device creates or restores.
• Shamir backup (SLIP-39). This splits the secret into several shares, a set number of which is needed to restore it. Keystone’s firmware notes list version 2.2.6 as “Compatible with the updated SLIP-39 protocol.” A SLIP-39 backup can only be restored on a wallet that supports SLIP-39, so check compatibility before you rely on it.

Keystone also lists a passphrase option, dice-roll entropy for generating your own phrase, and support for up to three separate seed phrases on one device, each opened with its own password or fingerprint. Our seed phrase guide explains BIP39 phrases and Shamir shares in more depth.

Which coins and wallets work with Keystone?

Keystone works through third-party software wallets. Its shop page names MetaMask, OKX Web3 Wallet, BlueWallet and Keplr among compatible wallets, and its product page advertises “45+” software wallets and “5500+” assets. Our dataset has not verified a current asset count for this model.

For bitcoin, Keystone offers Bitcoin-only firmware for the 3 Pro, and its product page says the device supports Bitcoin multisig and that Keystone’s team co-authored BIP-129, a standard for setting up multisig wallets across vendors.

Has the Keystone 3 Pro had security incidents?

Our dataset records none for this model. We found no published physical attack and vendor fix specific to the 3 Pro in the sources we inspected, and we did not attribute findings about earlier Keystone generations to this one. That is the result of our search, not proof that no issue exists.

What we could not verify

• Release year: Keystone published development announcements in 2023, but we did not establish when the 3 Pro first went on sale.
• A current asset count for the 3 Pro.
• Which BIP39 phrase lengths the device creates and restores.
• Certifications for the three chips, and the chip names on the current product page.
• The open-source licence and whether builds are reproducible.
• Country of manufacture: not stated on the pages we checked.

Read how we build each datasheet in our methodology.