Control in crypto is determined by who can authorize transactions.

A wallet app may display balances, prepare transactions, and provide an interface for interacting with blockchains, but control is defined at the point of approval. The entity that can authorize a transaction is the entity that controls the crypto.

Understanding this distinction is essential to understanding how wallet apps actually work.

Control Is About Authorization, Not Interface

Wallet apps are interfaces.

They allow users to view balances, construct transactions, interact with smart contracts, and monitor activity. None of these actions move funds on their own.

Control only exists at the moment a transaction is signed and approved. Whoever holds the authority to approve that transaction controls the crypto, regardless of how polished or accessible the interface may be.

Custodial Wallet Apps

In custodial wallet apps, transaction approval is controlled by the service provider.

The app user can request actions, but the provider holds the signing authority. This means the provider can approve, delay, restrict, or block transactions depending on internal rules, policies, or external requirements.

In this model, the user has access, but not control.

Non-Custodial Wallet Apps

In non-custodial wallet apps, transaction approval is controlled by the user.

The private keys or signing authority remain under user control, and transactions cannot be approved without the user’s direct authorization. The app provides the environment to interact with crypto, but it does not possess the authority to move funds independently.

This is what self custody means in practice.

Mobile Wallet Apps and Control

Being mobile-first does not determine custody.

A mobile wallet app can be custodial or non-custodial depending entirely on how transaction authorization is handled. The device type does not change who controls signing authority.

Modern mobile wallet apps can provide full self custody while remaining easy to use and accessible.

Separation of Use and Control

A common source of confusion is treating usage and control as the same thing.

Using crypto includes viewing balances, preparing transactions, and interacting with networks. Control exists only when a transaction is authorized and signed.

Modern wallet design separates these layers. Interaction can remain flexible and connected, while authorization remains tightly controlled by the user.

Where Zypto App Fits

Zypto App is a non-custodial crypto app.

Users control transaction approval for their wallets, while the app provides the interface to manage assets, prepare transactions, and interact with blockchains. Zypto does not hold signing authority over user funds.

This structure allows users to retain control while using a mobile-first environment.

Optional Physical Authorization

Some non-custodial wallet apps allow users to add additional authorization controls.

In Zypto App, users can optionally attach the Vault Key Card to wallets. When attached, transaction approval requires physical card presence. When not attached, wallets continue to use app-only signing.

In both cases, control remains with the user.

Control Determines Ownership

Ownership in crypto follows control.

If a user controls transaction approval, they control the crypto. If a third party controls approval, the crypto is custodial regardless of how the app is presented.

Understanding who controls authorization is the clearest way to understand who controls crypto in a wallet app.

→ What Is a Crypto Wallet?
→ What Is Self Custody in Crypto?
→ Custodial vs Non Custodial Crypto Wallets
→ Do You Own Your Crypto If It’s in a Wallet App?
→ How Crypto Wallets Store Private Keys
→ When Should You Use a Mobile Crypto Wallet?
→ What Happens If You Lose Access to Your Crypto Wallet?
→ Are All Crypto Wallets the Same?
→ Why Wallet Choice Matters in Crypto
→ Can One Wallet Hold Multiple Blockchains?