Keystone 3 Pro

The Keystone 3 Pro is Keystone's flagship air-gapped hardware wallet, built around a single principle: your private keys should never touch a network, a cable, or another device. Unlike USB or Bluetooth wallets, the 3 Pro signs every transaction by scanning QR codes on its 4-inch touchscreen, so the device has no data path that an attacker can reach remotely.

Priced at $149 on keyst.one, the 3 Pro is positioned as the premium secure alternative to mainstream USB wallets. What sets it apart is three independent EAL5+ secure element chips — an industry first — which separately protect the seed phrase, fingerprint data and firmware. Keystone is also the first hardware wallet to publish open-source secure element firmware, allowing full code-level verification of how the chip handles your keys.

The device ships in three variants: the 3 Pro ($149), the 3 Pro + SD card ($159, for offline app installation and updates), and the 3 Pro + Wallet Pouch bundle (saves $8). Keystone also offers a Keystone Bundle Pack (3 Pro + steel seed tablet, $232.90 down from $252.90) and a paid Keystone Care+ replacement guarantee (1, 2 or 3 years) that ships a brand-new device on any quality issue — no repairs, so a compromised unit never keeps your key.

On the software side, the 3 Pro supports 5,500+ coins and tokens via the Keystone companion app and integrates natively with MetaMask, Solflare, Rabby, Keplr and WalletConnect v2, letting you keep your keys cold while signing DeFi, staking and dApp transactions from your normal hot wallet interface. Backup is handled through standard BIP39 or Shamir's Secret Sharing (SLIP-39), and the device includes an integrated fingerprint reader for PIN-free unlock.

Air-Gapped QR Signing

• The 3 Pro has no Bluetooth and no WiFi; the only physical connector is USB-C, used for charging only.
• Every transaction is signed offline by displaying/scanning QR codes on the 4-inch touchscreen, so private keys and signed payloads never travel over a cable or network.
• This eliminates entire attack classes — malicious USB hosts, Bluetooth sniffing, and remote network exploits — that affect connected wallets.

4-Inch Touchscreen & Full Transaction Preview

• One of the largest displays on any hardware wallet, large enough to show a full transaction preview (addresses, amount, fee, contract data) before you confirm.
• Reduces 'blind signing' risk: you can verify what you're approving on the device itself, not just on a phone screen.

Fingerprint Unlock & Passphrase

• Integrated fingerprint sensor unlocks the device and authorizes transactions without a PIN; fingerprint templates live inside a dedicated secure element and never leave the device.
• Optional BIP39 passphrase (25th word) support for a hidden wallet / plausible deniability setup.

5,500+ Coins & Wallet Integrations

• Supports Bitcoin, Ethereum, Solana, BNB Chain, Polygon, Arbitrum, Optimism, Cosmos, Polkadot and thousands of ERC-20 / SPL / BEP-20 tokens.
• Native QR integrations with MetaMask, Solflare, Rabby, Keplr and WalletConnect v2, so your existing hot-wallet UX stays the same while keys stay cold.

Shamir Backup & Variants

• Native Shamir's Secret Sharing (SLIP-39) support — split your recovery seed across multiple shard sets for resilience against loss or single-location theft.
• Variants: 3 Pro ($149), 3 Pro + microSD ($159, for offline app installs/updates), 3 Pro + Wallet Pouch (saves $8), and the Keystone Bundle Pack (3 Pro + steel seed tablet, $232.90).

Keystone Care+ Replacement Guarantee

• Paid 1-, 2- or 3-year warranty ships a brand-new device on any quality issue — no repair process, so a returned unit never retains your private key.
• Active 20% off discount for former Ledger users migrating to open-source cold storage.

Three Independent Secure Elements (Industry First)

• Keystone 3 Pro is the only hardware wallet with three separate EAL5+ secure element chips.
• Each chip guards a different asset: one protects the seed phrase, one protects fingerprint biometric data, one secures the device firmware and boot process.
• Compromising one chip does not expose the other two — a defence-in-depth model no single-chip wallet offers.

100% Open Source — Including Secure Element Code

• Keystone is the first hardware wallet to publish open-source secure element firmware, so independent auditors and users can verify exactly how the chip handles private keys.
• Full firmware, bootloader and companion app logic are reproducible and auditable; regular third-party audits are published.

Air-Gapped Attack-Surface Elimination

• No Bluetooth, no WiFi, no NFC data transfer. USB-C is charging-only — the data lines are not wired to the secure element.
• QR-code signing means a compromised computer or phone can never reach the device's private keys through a cable.

Anti-Tamper Self-Destruction

• If the device detects physical tampering, case-open events, or a firmware-integrity breach, the secure elements automatically wipe the seed phrase and sensitive data to prevent extraction.
• A last-line defence against supply-chain intercepts, invasive hardware attacks and boot-time exploits.

Biometric & Passphrase Safeguards

• Fingerprint templates are stored encrypted inside a dedicated secure element and never leave the device.
• BIP39 passphrase support enables a hidden wallet / plausible-deniability setup on top of the main wallet.

Keystone is built by Gravit, a hardware-wallet company focused on open-source, air-gapped cold storage. Keystone made its name as the first hardware wallet to publish open-source secure element firmware — allowing full independent verification of how the chip handles private keys, rather than trusting a vendor's closed binary.

The 3 Pro is sold worldwide directly from keyst.one and through a rated reseller network, with active Trustpilot reviews and a public support knowledge base. Keystone also offers the Keystone Bundle Pack (3 Pro + steel seed tablet) and the paid Keystone Care+ replacement guarantee, reflecting a focus on long-term secure ownership rather than disposable USB-stick wallets. The company actively courts migrating Ledger users with a standing 20% discount for Ledger owners switching to open-source cold storage.