The Vault Key Card works alongside Zypto App by separating interaction from authorization.
Zypto App remains the environment where users manage assets, review balances, prepare transactions, and interact with blockchains. The Vault Key Card acts as a physical approval layer that must be present before sensitive actions can be finalized.
This model allows cold storage protection to be applied without changing how the app itself is used.
Interaction Happens in the App
All transaction activity begins inside Zypto App.
Users create transfers, swaps, or other on chain actions in the same way they would normally. Transaction details, amounts, destinations, and network information are displayed clearly on the app screen for review.
At this stage, no authorization has occurred. The app prepares the transaction, but it cannot approve it on its own when a Vault Key Card is attached.
Authorization Requires Physical Card Presence
When a wallet is protected by the Vault Key Card, transaction approval requires a deliberate physical action.
To authorize a transaction, the user taps their physical Vault Key Card on their device’s NFC reader. Without this card interaction, approval cannot take place.
This keeps authorization offline and physically gated, even though the app itself remains connected and fully usable.
Split Key Authorization Model
The Vault Key Card uses a split key authorization model.
Transaction approval requires both the Zypto App environment and the physical card. Full signing authority is never available to software alone, and the card by itself is not sufficient to authorize transactions.
This design ensures that sensitive actions cannot be approved remotely or silently, even if a device or app environment is compromised.
Attaching Wallets to the Vault Key Card
Users can attach the Vault Key Card to up to three wallets inside Zypto App.
From the app’s home screen, the Vault Key Card is selected and a wallet is chosen from a list of existing wallets. The user is prompted to tap the physical card to complete the attachment, and a confirmation screen verifies that the wallet is now protected.
Attached wallets are listed clearly, making it easy to see which wallets require card approval.
Detaching Wallets When Needed
Wallets can be detached from the Vault Key Card when the original card is physically present.
From the Vault Key Card screen, users select a linked wallet and choose to unlink it. A card tap confirms the action, and the wallet returns to app only signing.
The Vault Key Card cannot be removed or bypassed without the physical card. If the card is lost, the wallet must be removed and reimported using its seed phrase before operating without card based authorization.
Detaching a wallet does not reset it, remove funds, or change how assets are held. It simply removes the requirement for physical card authorization.
Using Zypto App With or Without the Vault Key Card
Zypto App functions independently of the Vault Key Card.
When a wallet is attached to the card, transaction approval requires physical card presence. When a wallet is not attached, transactions can be approved directly within the app.
This allows users to decide when and where cold storage protection is applied, without forcing a single security mode across all activity.
Designed for Everyday Use
The Vault Key Card is designed to integrate naturally into mobile first crypto workflows.
Rather than introducing a separate device or interrupting app usage, it adds a physical security layer to the same environment where crypto is already managed. Interaction stays flexible. Authorization stays controlled.
This approach allows cold storage protection to align with real world crypto use, instead of limiting it.
Explore the Vault Key Card in Practice
→ What Is the Vault Key Card?
→ How the Vault Key Card Works With Zypto App
→ What the Vault Key Card Protects (and What It Doesn’t)
→ What Happens If You Lose the Vault Key Card?
→ Do You Need the Vault Key Card for Every Transaction?
→ When to Use the Vault Key Card vs App-Only Signing
→ Who Is the Vault Key Card For?
→ Vault Key Card vs Device-Based Hardware Wallets (When VKC Makes More Sense)
→ Is the Vault Key Card Worth Using If You’re New to Crypto?
FAQs
What does the Vault Key Card actually do?
The Vault Key Card provides physical authorization for protected wallets in Zypto App. It does not manage assets or display balances. It is used only to approve sensitive actions.
Does the Vault Key Card store my private keys?
No. The Vault Key Card uses a split key authorization model. Full signing authority is never held entirely on the card or entirely in software.
Can I use Zypto App without the Vault Key Card attached?
Yes. Zypto App works independently. When a wallet is not attached to the Vault Key Card, transactions can be approved directly in the app.
How many wallets can be protected by the Vault Key Card?
Up to three wallets in Zypto App can be attached to a single Vault Key Card at the same time.
What happens if I lose my Vault Key Card?
Losing the card does not remove funds or reset wallets. However, wallets that were linked to the card cannot approve transactions and cannot be unlinked without the original card present. To restore full control, the wallet must be removed and reimported into Zypto App using its seed phrase.
Can I detach a wallet from the Vault Key Card later?
Yes, but only while the original Vault Key Card is physically present. Detaching a wallet requires tapping the card to confirm. If the card is lost, the wallet cannot be unlinked and must be removed and reimported using its seed phrase.
