The Keystone 3 Pro is a hardware wallet produced by Keystone. It operates in a fully air-gapped mode by default. All data transfers between the device and connected software wallets happen through QR codes or a microSD card. There is no Bluetooth, no Wi-Fi, and no NFC. A USB-C port is present for charging and optional functions, including firmware updates and MetaMask desktop connectivity.
The display is a 4-inch TFT LCD color touchscreen at 480 x 800 pixels. The casing is made from PC and ABS plastic. The device measures 62.44 x 103.9 x 12.08 mm and weighs 103 grams. A fingerprint sensor handles optional biometric unlocking and transaction signing. The built-in Li-ion battery has a capacity of 1000 mAh (3.7 Wh) and charges at 5V/1A.
Three Secure Element chips each handle a separate security function: one for recovery phrase protection, one for the storage environment, and one for biometric data. The chip lineup includes the ATECC608B and DS28S60. The secure chip design is EAL6+ certified. Firmware and hardware schematics are fully open source. A PCI-grade self-destruct mechanism wipes all stored data if physical tampering is detected.
Up to three separate seed phrases can be stored simultaneously, each secured by its own password or fingerprint. The standard recovery phrase is 24 words (BIP-39). An optional passphrase (25th word) is supported. Shamir Backup (SLIP39) phrase generation is available through the device firmware. The box includes 6 Seed Phrase Sheets for manual paper backup. A microSD card is not included and must be purchased separately.
The device supports 5,500+ coins and tokens across 200+ blockchains. NFT management, DeFi access, and staking are available through compatible software wallets. The official companion app is Keystone Nexus, available for iOS and Android. Additional compatible wallets include MetaMask (EVM chains, via QR code and USB), BlueWallet (Bitcoin, mobile), Sparrow (Bitcoin, desktop), Rabby (EVM chains), OKX Web3 Wallet, Keplr, Solflare, and 45+ others listed at keyst.one/supported-wallets-and-assets.
Device verification is available via the official Keystone website to confirm the device has not been altered during shipping. This process uses QR code scanning.
In the box: Keystone 3 Pro, USB-C to USB-C charging cable, user manual, 6x Seed Phrase Sheets. MicroSD card is not included.
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