Keystone 3 Pro combines air-gapped signing with modern UX. Fingerprint sensor, large color touchscreen, and QR-only signing workflow give it security and convenience together. For users who want Coldcard-style air-gapping with multichain support, Keystone is the answer.
What Keystone 3 Pro actually is
Keystone 3 Pro is a fully air-gapped hardware wallet — no USB, no Bluetooth, no wireless of any kind. All transactions are transferred to and from the device via QR codes displayed on its large color touchscreen.
Supports 5,500+ assets across 100+ chains. Integrates with MetaMask, Rabby, and other software wallets for signing.
Air-gapped workflow
To sign a transaction:
- Build the transaction in your software wallet
- Show a QR code to Keystone's camera
- Verify transaction details on Keystone's screen
- Sign with fingerprint
- Keystone displays signed transaction as QR code
- Scan back into your software wallet to broadcast
This is more friction than USB-connected wallets, but eliminates a large class of attack vectors.
Who should use Keystone 3 Pro
- Users wanting air-gapped security with multichain support
- Users comfortable with the QR-only workflow
- MetaMask/Rabby users wanting the strongest signing device
Verdict
Keystone 3 Pro delivers Coldcard-style air-gapped security with multichain support and modern UX. The QR-only workflow takes practice but eliminates entire attack categories.