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MOBILE
APP

Manage your Cuvex cards effortlessly and intuitively, and view your wallet balance in real time. Enhance your privacy with Coin Control features when sending and receiving BTC.
 

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DOUBLE AIRGAP
PSBT WALLET

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First AirGap
The unsigned transaction is transferred to an NFC card via the Cuvex App and verified offline by the Cuvex device.

 

Second AirGap
If the transaction is valid, the Cuvex device requests a second NFC card containing the encrypted seed phrase and private keys to complete the signing process securely

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Will be available in March

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COIN CONTROL
FEATURES

Privacy by Design.

 

When generating an address, the process prompts you to label it with details such as observer, amount, and purpose, ensuring addresses are not accidentally reused.
 

Save your label file to seamlessly export your wallet to other smartphones.
 

Freeze UTXOs to prevent accidental spending.

WHY WITH
CUVEX?

Privacy
by Design

The app requires no personal data, registration, or accounts and operates with a strict zero knowledge policy, ensuring no information is shared.

Coin Control
by Design

Create accounts and new addresses, apply tags, freeze UTXOs, and export them simply and efficiently.

360° Self-Custody System

One device, countless secrets: wallets, inheritances, and more. Manage everything with Cuvex NFC cards, Watch-Only Wallets with PSBT, and cryptograms.

Alerts
 

Notifications for address reuse, rounding issues, fees, and balance, enhancing the privacy of your BTC. Cryptocurrency alert app when it detects balance movement in any of your wallets.

  • A Watch Only Wallet (WOW) is an application that exclusively manages the public key of your wallet. This means it is limited to performing operations such as balance verification, generating receiving addresses, and managing Coin Control functionality.

     

    A WOW, on its own, cannot sign transactions to send funds to any address.

  • A PSBT (Partially Signed Bitcoin Transaction) Hardware Wallet is a physical device capable of signing PSBT transactions.

    Typically, Watch Only Wallet (WOW) applications prepare the data required to construct a PSBT transaction and then send it to a hardware device equipped with the capability to sign such transactions.

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    PSBT hardware wallets usually store the private keys needed for signing these transactions. This process is commonly referred to as AirGap, as there is a physical separation between each component involved in the process.

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    However, only the Cuvex device implements a Double AirGap PSBT procedure, providing an additional layer of security.

    What Makes the Cuvex Double AirGap Process Unique?

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    Unlike traditional PSBT hardware wallets, the Cuvex device does not store any private keys, making it doubly secure. To sign a transaction using the Cuvex device, the following steps are required:

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    1. Create the PSBT transaction: Use the Cuvex App to prepare the transaction and record it onto a blank NFC card.

    2. First AirGap: Read the NFC card containing the unsigned transaction with the Cuvex device. Verify the transaction on the device.

    3. Second AirGap: If the user confirms the transaction, decrypt the private keys stored on a separate encrypted NFC card using the same Cuvex device.

     

    Key Advantages of the Cuvex Approach This unique process allows a single Cuvex device to be shared among multiple users, such as members of a family, enabling each person to sign transactions from different wallets using the same device. This unparalleled functionality makes the Cuvex device a standout solution in the blockchain and cryptocurrency sector.

  • Coin Control refers to a set of procedures that allow you to associate specific metadata with your transactions.

    This information is stored locally in your Watch Only Wallet (WOW) and is managed exclusively by you. It is not shared or stored elsewhere, ensuring full privacy.

     

    Key Features and Use Cases

     

    • Tagging Transaction Details: When generating a new receiving address in your wallet, Coin Control enables you to tag relevant information, such as the sender (person or entity) who is transferring Bitcoin to you. This allows you to track the receiving address you provided and monitor future payments.
       

    • Additional Metadata: You can also label the initial amount received, the purpose of the transaction, or any other details. This ensures you can always trace the origin of any payment and decide whether or not the original sender can monitor the future use of those received Bitcoins on the Bitcoin blockchain.
       

    • Privacy Alerts: Wallets with Coin Control can generate alerts to help you avoid common privacy pitfalls, such as:
       

      • Reusing addresses.
         

      • Overpaying transaction fees.
         

      • Creating transactions without change outputs.
         

      • Rounding errors and other situations that may compromise your financial privacy.

     

    These alerts aim to enhance your Bitcoin privacy and help you manage your funds securely.

     

    Privacy Implications of Coin Control

     

    One of the most critical aspects of Bitcoin privacy is understanding that when you receive Satoshis in your wallet, you share the receiving address with the sender. This means the sender can monitor how you spend those Bitcoins in the future.

    Additionally, when you send Bitcoin to a third party without using Coin Control, you may unknowingly reveal significant information about your total holdings. Many wallets reuse addresses or store all available funds in a single address.

     

     

    A Real-World Example

    Let’s say your wallet has $100,000 in Bitcoin in one address. Without effective Coin Control, when you send $100 to a third party, the transaction will:

     

    1. Transfer the full $100,000 to the blockchain.
       

    2. Deduct $100 for the payment.
       

    3. Return $99,900 to a newly generated change address.
       

     

    The recipient of your $100 payment can see the change address on the blockchain and deduce the total value of your wallet, which poses significant privacy and security risks.

     

    By leveraging Coin Control, you can mitigate these risks, ensuring greater privacy and control over your Bitcoin transactions.

  • Absolutely nothing!

     

    The Cuvex App is one of the few applications that adheres to a strict zero-knowledge policy. This means that no user data is collected or stored on Cuvex servers.

     

    Unlike most apps on the market, Cuvex does not require users to create a profile. You are not asked to provide an email, password, OTP verification, or undergo any KYC process.

     

    All information entered into the app is stored securely in your smartphone’s secure element. Furthermore, this information is not personal and serves solely as internal management data for the user, with no intrinsic value.

     

    As such, if you lose your smartphone, there is no need to worry about the information stored in the Cuvex App.

     

    Restoring Your "Profile" on a New Smartphone

     

    To restore your app setup on a new smartphone, simply download the Cuvex App from the official app store.

    Since there is no login option, your data cannot be recovered from Cuvex servers. Instead, you’ll need to re-link your Cuvex cards as you did with your previous smartphone.

     

    The app will prompt you to create a PIN. This process is conducted entirely on your smartphone, with no data being transmitted over the internet or shared with anyone else. The PIN is stored in your smartphone’s secure element and is known only to you.

     

    Once you access the main menu of the app, you’ll need to re-link your Cuvex cards:

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    1. Choose the design of your card or take a photo of your personalized card.
       

    2. Start the card linking process. This will activate your smartphone’s NFC, and simply bringing your card close will allow the app to read basic administrative information such as the card alias, firmware version, and hardware version used to create the cryptogram.
       

     

    It’s important to note that the app does not store or read the cryptogram itself. It only accesses non-encrypted card information needed for administrative purposes.

     

    This information is securely stored in your smartphone’s secure element and can be managed entirely offline.

    If the linked card contains information for a wallet created with the Cuvex device using the Dice and Coin method, and you have a backup file of your labels, you can import that file to restore all label information and the wallet’s privacy settings.

     

    In Summary

     

    The Cuvex App ensures your information remains private and accessible only to you. It does not share data with anyone else.

     

    You can restore your "profile" on any new app installation by re-linking your Cuvex cards and, if applicable, importing the backup files of your labels associated with your UTXOs.

  • The cryptocurrency alerting app provides you with important notifications so that you can be aware of relevant events, such as changes in your wallet balance, fund movements and other events related to your cryptocurrency activity.

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COIN CONTROL
FEATURES

Privacy by Design.
Create hardened or non-hardened accounts with ease.

When generating an address, the process prompts you to label it with details such as observer, amount, and purpose, ensuring addresses are not accidentally reused.
 

Save your label file to seamlessly export your wallet to other smartphones.
 

Freeze UTXOs to prevent accidental spending

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