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Keystone 3 Pro review

Last reviewed 2026-08-25

Security warning

Three independent security chips hold the seed and fingerprint data, the case is built to wipe internal data if it is opened, and both hardware and software are published as open source. Nothing signs over USB or Bluetooth: transactions move by QR code or microSD card, so a compromised computer has no data path to the device. No breach or firmware exploit specific to the Keystone 3 Pro has been publicly documented.

Buy the Keystone 3 Pro if you want air-gapped signing on a screen you can actually read. $149 gets you a 4 inch color touchscreen, a fingerprint reader and three independent security chips, with QR codes and a microSD card as the only ways data moves in or out.

That combination matters for a specific reason. Air-gapped devices are safer because they never speak USB or Bluetooth to your computer, but they are usually harder to live with, and a cramped screen is where mistakes happen: an address half-checked is an address not checked. Keystone spends its size budget on a phone-sized display that shows full transaction detail, including decoded smart contract data, instead of asking you to approve something you cannot read. It also supports passphrases, Shamir backup, dice-roll entropy for people who do not want to trust any device's randomness, and multisig setups following BIP-129, a standard Keystone's team co-authored.

The hardware claims are Keystone's own and worth stating precisely: three independent security chips holding the seed and the fingerprint data, PCI-level anti-tamper that wipes internal data if the case is opened, and open source hardware as well as software. Firmware updates arrive over WebUSB, or from a microSD card if you keep air-gap mode switched on. A 1000mAh battery means it works away from a desk.

It is not bitcoin-only: Keystone counts more than 5,000 assets and over 45 compatible software wallets, MetaMask, Sparrow and Nunchuk among them. If you hold only bitcoin, a bitcoin-only signer keeps more code off the device.

Buy the Keystone 3 Pro
Made by
Keystone
Type
Hardware device
Price
$149
Runs on
iOS, Android
Who holds the keys
self-custodial, seed split across three independent security chips, air-gapped by QR code and microSD
Bitcoin only
No, multi-asset
Screen
4 inch color LCD touchscreen with fingerprint unlock
Connectivity
QR codes and microSD for signing, with no USB or Bluetooth data path; WebUSB firmware updates only with air-gap mode off
Coin support
Multi-asset: Keystone counts more than 5,000 coins and tokens and over 45 compatible software wallets

Where you can get the Keystone 3 Pro

Keystone's shipping-regions page opens by saying it offers worldwide delivery to all countries, then publishes the real list underneath: 56 countries, each with its own products and shipping rates, followed by the line that if your country is not on the list you should try Keystone's other official stores and resellers. The list closes on the inclusion side, so these 56 are what it names and the sentence above it is marketing rather than a country policy. Resellers and Amazon country stores are not Keystone's own shipping, so they are not counted here.

Pros and cons

What works

  • Three secure element chips, against one on Ledger's and Trezor's flagship devices
  • A 4 inch touchscreen that shows full transaction detail, including decoded contract data
  • Fully air-gapped: signing happens over QR codes or microSD, never USB or Bluetooth
  • Fingerprint unlock and anti-tamper protection that wipes data if the case is opened
  • Dice-roll entropy, Shamir backup and BIP-129 multisig, a standard Keystone co-authored

What to watch

  • Not bitcoin-only, so multi-chain parsing code runs on the device
  • Keystone's shipping page claims worldwide delivery and then publishes a 56 country list
  • Air-gapped signing means scanning QR codes for every transaction, which is slower than plugging in a cable
  • A newer brand with a shorter public track record than Ledger or Trezor

Worth comparing

Frequently asked questions

Does the Keystone 3 Pro work with MetaMask?

Yes. Keystone lists MetaMask among more than 45 compatible software wallets, alongside Sparrow and Nunchuk, and pairs with them by scanning QR codes rather than plugging in a cable.

Does Keystone ship to my country?

Keystone's shipping-regions page says it delivers worldwide, but the list underneath that sentence covers 56 countries with published rates. If yours is not on it, Keystone tells you to use its other official stores and resellers, which is not the same as Keystone shipping to you.

Is the Keystone 3 Pro really air-gapped?

For signing, yes. Transactions move in and out by QR code or microSD card, with no USB or Bluetooth data path. Firmware can be updated over WebUSB, but only if you switch air-gap mode off, and you can update from a microSD card instead and leave it on.

Is the Keystone 3 Pro bitcoin only?

No. Keystone counts more than 5,000 supported coins and tokens. If you hold only bitcoin, a bitcoin-only device such as a Blockstream Jade or the BitBox02 Bitcoin-only edition keeps other chains' code off the hardware entirely.

Sources