The Vault Key Card is only required for transactions made from wallets that are linked to it.

When a wallet is attached to the Vault Key Card, physical card presence is required to approve transactions. When a wallet is not attached, transactions can be approved directly within Zypto App.

This allows users to decide where cold authorization protection is applied.

How Authorization Works With Attached Wallets

When a wallet is attached to the Vault Key Card, transaction approval is physically gated.

Transfers, swaps, and other on chain actions must be confirmed by tapping the physical Vault Key Card on the device using NFC. Without the card present, approval cannot occur.

This applies only at the moment of authorization. Transaction preparation, balance review, and interaction all continue as normal inside Zypto App.

Transactions Without the Vault Key Card

If a wallet is not attached to the Vault Key Card, the app operates normally.

Transactions can be reviewed and approved directly within Zypto App using app-only signing. No physical card interaction is required.

This allows users to maintain flexibility across different wallets or usage contexts.

Mixing Protected and Unprotected Wallets

The Vault Key Card does not enforce a single security mode.

Users can attach up to three wallets to the Vault Key Card while leaving other wallets unprotected. Each wallet behaves independently based on whether it is attached or not.

Additional wallets can be protected by using additional Vault Key Cards.

This makes it possible to apply cold authorization protection selectively rather than universally.

Attaching and Detaching Changes the Requirement

Whether the Vault Key Card is required depends entirely on attachment status.

When a wallet is attached, physical card presence is required for approval. When the original card is physically present, a wallet can be detached and returned to app-only signing with no changes to balances, history, or configuration.

If the card is unavailable, the wallet must be restored using its seed phrase before operating without card-based authorization.

No balances are reset and no funds are moved during this process.

Choosing When Cold Authorization Is Used

The Vault Key Card is designed to be optional.

Users can decide when cold authorization protection makes sense and change that decision over time. Some wallets may require physical approval for every transaction, while others may not.

This approach allows cold storage protection to adapt to real usage rather than forcing all activity into a single mode.

Control Without Restriction

The Vault Key Card adds control without limiting access.

Zypto App remains fully usable at all times. The only difference is whether transaction approval requires physical presence.

This keeps security deliberate while preserving flexibility.

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