The Coldest
Crypto Wallet

The only air-gapped crypto wallet with the highest security certification in the blockchain & financial industry.
+3 500 coins and tokens. Your favourite crypto and Ethereum NFTs.
Ultimate security. Only financial product with EAL7 certification.
Just like a phone. 4” color touch screen. Your crypto at your fingertips.
Air-gapped. No USB, Bluetooth, NFC, WiFi or 4G. Transact via QR codes.

The wallet for total peace of mind

NGRAVE ZERO is the air-gapped wallet for serious crypto investors. With its EAL7 certification, multi-layered tamper proofing, biometrics and a custom OS, this wallet has everything you need for total peace of mind.

Anti-tampering Self-destruction

Transfer with ease and transparency

Initiate transactions on your LIQUID app, generate a Transaction QR code, scan and sign offline with ZERO.
It’s fast, secure and fully offline.

Discover our mobile app
100% Air-gapped
QR Code Signing

Tap and swipe. Just like a phone.

Forget about tiny buttons and small screens. Easily manage your crypto with ZERO’s 4” high-quality touch screen. NGRAVE improved every flow to offer a seamless crypto experience.

4” Touch Screen
Custom OS

More than enough storage for your crypto

Protect your different crypto. On your ZERO you can create more than 100 accounts. All your wallets can finally be held on one device.

+ 100 Accounts
Secure Firmware Update

Jean Jacques Quisquater,
2nd reference Bitcoin Paper

“What sets NGRAVE apart is the seamless integration of these three products, never compromising on security, always achieving a frictionless experience.”

Highest Certified Financial product

The only crypto hardware wallet with EAL7 certification.


ZERO is connectionless. It does not rely on USB, WiFi, Bluetooth, NFC, or 4G to sign transactions. All communication happens via transparent QR codes.

Learn more

Custom OS

ZERO’s Operating System (OS) was developed from scratch by our security experts. While some hardware wallets rely on mobile phone operating systems, NGRAVE removes any associated vulnerabilities with its own OS.

Passphrase and hidden wallets

This security feature extends your Perfect Key or seed phrase. Adding a passphrase creates a new hidden wallet with new coins and addresses. They are not stored on ZERO, and you can create as many as you want.

Learn more

Enhanced security with biometrics

ZERO's biometric sensor adds a layer of security for authentication and transaction signing. Your fingerprint is used as a variable to create your Perfect Key, unlock your device, and to sign transactions alongside a robust 8-digit PIN code.


A revolution in

key generation

We give you all the tools to create the safest key to truly own your crypto. Not your keys, not your crypto.

For your eyes only

The NGRAVE Perfect Key is the equivalent of a traditional 24-word seed phrase in a 64-character hexadecimal format. ZERO uses your biometrics and allows you to shuffle parts of your key to generate the Perfect Key.


The NGRAVE Perfect Key

The NGRAVE Perfect Key is convertible into a traditional 24-word seed phrase. You can easily visualise it in your ZERO and are always free to import your seed into another wallet.

Never lose your keys again

Your backup should be easy to understand for you and an enigma for anyone else. The hexadecimal format of your Perfect Key allows you to back it up on GRAPHENE, the first encrypted and recoverable stainless steel backup.


crypto support

We support 15 coins and all Ethereum and MultiversX tokens.


Hear from the


“What sets NGRAVE apart is the seamless integration of these three products, never compromising on security, always achieving a frictionless experience.”

Jean Jacques Quisquater,
2nd reference Bitcoin Paper

“They go into security as if they were completely paranoid...The device is truly amazing.”

Leading French Influencer

“Gold standard of hardware wallets.”

Crypto Analyst and Influencer


NGRAVE store

Start truly owning your crypto

Next-Day Free Shipping. We ship the very next day. Free for orders above $300.

Flexible payment options. Pay with credit card, Bancontact, or even crypto.

Made in Belgium. All our products are manufactured in Belgium, Europe.

30-day return. Return within 30 days and get all your money back.

Still got some


  • ZERO specifications

    Last updated November 10, 2021 11:31


    • Width: 125mm (4.92").

    • Height: 70mm (2.7").

    Thickness: 13mm (0.51").

    Weight: 180g (6.3 oz)


    • The ZERO is made from a customized alloy of zinc, aluminum, magnesium and copper for optimal durability, protection, weight and feel.


    • English, Spanish, French and Dutch will be supported on V1.0. However, new languages will be added and available through firmware updates.


    • The ZERO screen is of high quality with a size of 101,6 mm (4”) diagonal LCD, high pixel density at 480 x 800 pixels, high clarity of 600Cd/m2, and is a capacitive Touch Screen.

    Power management / battery:

    • The ZERO comes with high-efficiency power management, including a built-in 1200 mAH battery with a USB-compatible charger.


    • The device comes with a built-in USB-C port that allows for wall charging (a USB-C cable is also provided in the box).

    MCU / Micro-Controller Unit(s):

    • Unlike other hardware wallets, the ZERO has no Micro-Processing Unit (MCU). Instead, it features a much more powerful micro-processing unit (MPU). This gives it a larger memory capacity and computing power...

    Full specifications:

    • 2019 STM32MP157C (High Performance Dual-core ARM® Cortex®-A7 including ARM® NEON and ARM® Trustzone® + ARM® Cortex®-M4 with FPU/MPU) with Secure Boot, Secure RAMs, Secure RTC, Active Tamper and Trustzone® Peripherals, Cortex M4 Resources Isolation. Ultra low power consumption.

    SE / Secure Element:

    • The ZERO has a built-in state-of-the-art secure element, a customized and upgraded version of the STSAFE A100 from ST-Electronics.


    • There is a 12x12mm fingerprint sensor on the back of the ZERO.


    • The back of the ZERO features a camera (640 x 480) that is used to scan QR-codes for transactions and also to generate additional randomness separate from the built-in chip during the key generation process.

    Water and dust resistance:

    • The ZERO is IP55-certified and is resistant to water and dust.

    More information

  • What is the cryptographic support on ZERO?

    Last updated September 05, 2022 15:29

    ZERO supports a wide range of cryptographic protocols, in order to facilitate adding support for new coins. At this moment, the protocols below are supported.

    Message Digest:

    • RIPEMD160, SHA224, SHA256, SHA384, SHA512, SHA3, SHA3-XOF, KECCAK, BLAKE2B, Grøstl

    Cryptography Key, with key generation:

    • DES (56, 112, 168 bits), AES (128, 192, 256 bits), ECC (256 bits), RSA (1024, 2048, 3072,4096 bits) RSA encryption with PKCS1 v1.5, PKCS1 OEAP, NOPAD schemes HMAC Signature: HMAC-SHA256, HMAC-SHA512 RSA Signature with PKCS1 v1.5, PKCS1 PSS schemes Elliptic Curve Signature: ECDSA/EC-Schnorr (SECP256K1, SECP256R1, Brainpool256R1, Brainpool256T1), EdDSA (Ed25519) Elliptic Curve Diffie Hellman: ECDH (SECP256K1, SECP256R1, SECP521R1, Brainpool256R1, Brainpool256T1, Curve25519) Symmetric Cryptography: DES, Triple-DES, AES with ISO9797M1, ISO9797M2, NOPAD schemes Random Number Generation: RND, Prime RND (hardware support TRNG), NIST SP 800-90A CTR DRBG

    More information

  • Can I buy NGRAVE products via resellers such as Amazon?

    You can only order your ZERO in the NGRAVE webshop or Amazon US (COMBO). At this moment we don't work with any resellers.

    If another party than NGRAVE offers you to buy a ZERO do not give them your money. In case of doubt, always consult with us via

  • Can I convert the NGRAVE "Perfect Key" to 24 words?

    Last updated December 16, 2023 19:45

    Yes. The hexadecimal “Perfect Key” can easily be converted into the 24-words version and vice versa. Both are alternative representations of a 256-bit private key.

    • On the ZERO, you can easily see both versions. Go to SettingsDisplay secret key, enter your PIN code and then select Mnemonic or NGRAVE wallet.

    • If you need to do the conversion yourself, you can use this tool: 

    NEVER USE THIS TOOL ONLINE with your key!

    There is always a risk that your communication is intercepted or the website logs your private key data, which might result in your funds being stolen. You should always download this tool and run it on your own computer. Best practice is that your backup is never entered on a computer. So only use this tool when you need to. We recommend to move your funds to a new wallet afterwards to preserve optimal security.

    How can you a convert between formats?

    In short, using the Coleman tool boils down to this:

    • Download the tool to your computer and open it.

    • To convert from mnemonic words to hexadecimal format, fill in the field  'BIP39 Mnemonic' and tick 'Show entropy details'.
      The hexadecimal format is in the field 'Entropy'.

    • To convert from hexadecimal format to mnemonic words, tick 'Show entropy details' first and only then fill in the field  'Entropy' . The 24 words format is in the field 'BIP39 Mnemonic'.

    More information