Cryptnox crypto hardware wallet dual card set for secure cryptocurrency cold storage

Cryptnox crypto card with FIDO2 authentication

Cryptnox secure crypto hardware wallet card

Cryptnox hardware wallet NFC smart card dual set

Cryptnox NFC hardware wallet secure chip technology

Cryptnox SA

Cryptnox Crypto Hardware Wallet — Smart Card Cold Storage with Dual-Card Backup

The Cryptnox crypto hardware wallet is a Swiss-engineered smart card that secures Bitcoin, Ethereum, 1,000+ EVM tokens, Tron (TRX, TRC-20), XRP, and other supported chains entirely on-card via an EAL6+ certified secure element. The Dual Card Set ships with a primary card and a backup card initialized with the same seed — recover full access instantly if the primary is lost, with no 24-word seed phrase to protect. The cards also accept an externally injected seed via the Cryptnox app, ideal for users migrating from another wallet or who want a copy of the seed for off-card backup. See cryptnox.com/coin-blockchain-support for the full list.

Cards also ship with FIDO2 Functionalities now!

For more information, Learn about Cryptnox FIDO2 security key.

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Description

Customer rating: ★★★★½ 4.4 / 5 — based on 41 Amazon customer reviews. Read on Amazon.

The Cryptnox crypto hardware wallet is a Swiss-engineered smart card that secures your Bitcoin, Ethereum, 1,000+ EVM-compatible tokens, Tron (TRX and TRC-20), XRP, and other supported chains entirely on-card. Private keys are generated inside an EAL6+ certified secure element and never leave the chip. The Dual Card Set ships with a primary card and a backup card initialized with the same seed, so you can recover full access instantly if the primary is lost or stolen — without writing down or protecting a 24-word seed phrase.

Cold storage in a smart card form factor

Most hardware wallets are USB devices that plug into a networked laptop. The Cryptnox crypto hardware wallet is a smart card — between transaction signings the card is fully offline, with no charging, no batteries, and no cables. To sign a transaction, you bring the card near your phone in the Cryptnox app (the NFC antenna location varies by phone model). The brief signing session uses an authenticated, encrypted secure-messaging channel between the card and the app — the link itself cannot be eavesdropped or replayed, even though it travels over NFC. Outside that signing handshake, the card stays fully offline — colder than any USB hardware wallet that remains plugged into a networked machine.

Two initialization methods — choose what fits your security posture

The Cryptnox crypto hardware wallet supports two initialization paths, depending on your goal:

Method 1 — On-chip seed generation (default, recommended): the Dual Card Set initializes both cards simultaneously with the same seed, generated inside the cards using the on-chip TRNG (true random number generator). The seed never leaves either card. The first card is for daily use; the second is your built-in backup. If the main card is ever lost or damaged, the backup restores full access instantly — no 24-word seed phrase to write down or protect. Step-by-step: Dual Card setup tutorial.
Method 2 — External seed injection (migration / advanced): the cards can accept an externally generated seed via the Cryptnox app — useful if you’re migrating from another wallet (importing an existing 12/24-word BIP39 seed) or if you want a copy of the seed available off-card. See our 12/24-word mnemonic setup tutorial.

MetaMask, Uniswap, and DeFi compatibility

The Cryptnox crypto hardware wallet works with two standard integrations:

MetaMask browser extension — pair Cryptnox via the QR-based wallet-signing standard. MetaMask handles dApp connection and transaction building in the browser; the Cryptnox card signs each transaction on-device after a phone confirmation. Step-by-step: MetaMask + Cryptnox setup guide.
DeFi platforms (Uniswap, Aave, bridge aggregators, NFT marketplaces, etc.) — connect via WalletConnect. The dApp displays a QR code, you scan it in the Cryptnox app, and sign with the card. See how to use WalletConnect with Cryptnox.

In both paths, your private keys never leave the card’s secure element. See the full list of supported coins and blockchains for the complete catalog of EVM chains, altcoins, and tokens.

How to use the card on your phone or desktop

For mobile signing, just hold the card near any NFC-capable phone in the Cryptnox app — no contact reader required. For desktop browsers, scan a WalletConnect QR code with the Cryptnox app and sign on your phone. If you prefer to sign from a desktop directly via the contact interface, the Cryptnox dual-slot Smartcard Reader works with the card via the ISO 7816 contact interface.

For setup walkthroughs, integration guides, and troubleshooting, browse our hardware wallet tutorials hub.

Features

Cold storage in a wallet-friendly card

True cold storage: the card is offline 100% of the time except during the brief signing session. No always-on USB connection to a networked laptop.
EAL6+ secure element: the same chip class used in banking and government-grade smart cards. Private keys are generated and stored inside the chip; they never leave it.
Encrypted signing channel: every signing session between the card and the Cryptnox app uses an authenticated, encrypted secure-messaging channel — the data exchanged with the card cannot be intercepted or replayed, even on the NFC link.
Wallet-friendly form factor: credit-card sized, fits in any wallet cardholder. No keychain dongle, no charging cable, no battery.
Dual-card backup: recover instantly from a lost or damaged primary card without seed-phrase paranoia.

Two ways to initialize — choose your seed-management model

On-chip seed generation (default): both cards in the Dual Card Set are initialized simultaneously with a seed generated by the on-chip TRNG. The seed never leaves either card. Highest-assurance posture for users who want zero exposure of the seed outside hardware. See the Dual Card setup tutorial.
External seed injection: the cards accept an externally generated seed via the Cryptnox app. Use this for wallet migration (importing a 12/24-word BIP39 seed from another wallet) or when you want a copy of the seed for an off-card backup strategy. Walkthrough: mnemonic setup tutorial.

Supported coins and blockchains

The Cryptnox crypto hardware wallet supports Bitcoin, Ethereum, 1,000+ EVM-compatible tokens and altcoins, Tron (TRX and TRC-20 tokens), and XRP (XRP Ledger) — all pre-programmed in the free Cryptnox app for iOS and Android. The complete list of coins and blockchains supported out of the box is published at cryptnox.com/coin-blockchain-support; advanced users can also add additional tokens manually. WalletConnect adds compatibility with the entire DeFi ecosystem on every supported chain.

How signing works

Mobile: install the free Cryptnox app on iOS or Android, build the transaction in the app, hold the card near the phone (NFC antenna location varies by phone) to sign. Signing channel is encrypted end-to-end.
MetaMask + browser: pair the card via the QR-based wallet-signing standard. Setup walkthrough.
DeFi (Uniswap, Aave, NFT marketplaces, bridge aggregators): via WalletConnect. The dApp displays a QR code; scan it in the Cryptnox app and sign with the card.
Desktop direct (optional): use a contact smart card reader like the Cryptnox dual-slot Smartcard Reader to sign without a phone.

What’s in the Dual Card Set

2 × Cryptnox crypto hardware wallet cards (primary + backup)
Both cards from the same production batch — uniform firmware
Initialize together for shared seed (default) or independently if your scenario demands
Free Cryptnox app for iOS and Android

Browse the full hardware wallet tutorials catalog for setup walkthroughs, integration guides, and troubleshooting.

Specifications

Technical specifications

Form factor: ISO/IEC 7810 ID-1 (CR80, credit-card size)
Interface: NFC (ISO/IEC 14443 Type A) + contact (ISO 7816)
Secure element: EAL6+ certified chip
Random number generator: on-chip TRNG (true random number generator)
Key storage: private keys generated and stored inside the secure element; never leave the chip
Communication security: authenticated, encrypted secure-messaging channel between the card and the Cryptnox app — protects every signing session against eavesdropping or replay
Initialization options: (1) on-chip TRNG seed generation, with both Dual Card Set cards initialized simultaneously to the same seed; (2) externally injected BIP39 seed via the Cryptnox app, for wallet migration or off-card backup scenarios
Power: passive — no battery, energy harvested from the NFC reader’s RF field
Mobile app: free Cryptnox app for iOS and Android
Desktop integrations: MetaMask via QR-based wallet-signing standard; WalletConnect for DeFi platforms; optional direct desktop signing via the Cryptnox dual-slot Smartcard Reader over ISO 7816 contact

Pack contents

2 × Cryptnox crypto hardware wallet cards (primary + backup)
Cards initialize with a shared seed via the Cryptnox app, or independently if preferred

Compliance

EAL6+ secure-element certification
ISO/IEC 7810 (card form factor)
ISO/IEC 7816 (contact interface)
ISO/IEC 14443 (NFC interface)

Frequently Asked Questions

Which cryptocurrencies does the Cryptnox hardware wallet support?

The Cryptnox hardware wallet card supports a wide range of cryptocurrencies through the free Cryptnox app — Bitcoin, Ethereum and the 1,000+ EVM-compatible tokens and altcoins, Tron (TRX and TRC-20 tokens), and XRP (XRP Ledger). The full list of coins and blockchains pre-programmed in the app is published at cryptnox.com/coin-blockchain-support — additional chains and tokens can be added manually for advanced users. Through WalletConnect, you can also use the card with DeFi aggregators, DEXs, NFT marketplaces, and bridge aggregators on any chain your dApp of choice supports.

Is this a cold storage wallet?

Yes — it’s a true cold-storage device. Private keys are generated inside the card’s EAL6+ secure element and never leave it. The card only signs transactions when tapped against your phone via NFC; between taps, nothing is online. That’s colder than any USB hardware wallet that plugs into a networked laptop.

How is the Cryptnox “dual card” different from a single hardware wallet?

The Dual Card set lets you initialize both cards simultaneously with the same seed — generated inside the cards using the card’s on-chip TRNG (true random number generator). The seed never leaves either card. The first card is for daily use; the second is your built-in backup, stored somewhere safe. If the main card is ever lost, the backup restores full access instantly — no 24-word seed phrase to write down or protect. Alternatively, the cards can accept an externally generated seed via the Cryptnox app (injected over NFC) if you’re migrating from another wallet.

Does the Cryptnox wallet work with MetaMask, Uniswap, and other dApps?

Yes — through two standard integrations depending on the platform:

MetaMask browser extension: pair Cryptnox via the QR-based wallet-signing standard. MetaMask handles dApp connection and transaction building in the browser; the Cryptnox card signs each transaction on-device after a phone tap. You keep MetaMask’s familiar dApp UX with hardware-wallet-level security underneath.
DeFi platforms (Uniswap, Aave, bridge aggregators, NFT marketplaces, etc.): connect via WalletConnect. The dApp displays a QR code, you scan it in the Cryptnox app, and sign the transaction by tapping your card against your phone.

In both paths, your private keys never leave the card’s secure element.

How do I actually sign a transaction — app, cable, or what?

You install the free Cryptnox app on iOS or Android, connect your hardware wallet card by tapping it against your phone (NFC), and confirm transactions in the app. For desktop browsers, scan a WalletConnect QR code with the app and sign on your phone. No USB cables, no batteries, no charging.