When people buy cryptocurrencies for the first time, they usually see only a number in an app—for example, a certain amount of Bitcoin, Ethereum, or another cryptocurrency. At first glance, it looks very similar to online banking. You open the app, sign in, and see your balance.

This is where one of the most common beginner misconceptions arises. Many people think that cryptocurrencies are stored directly in the app, on their phone, or on their computer.

In reality, they are not. Cryptocurrencies are not physically stored on any device. Nor are they files sitting in a folder on a computer. They exist as records on a blockchain. What determines who can use them is not the app itself, but access to cryptographic keys.

That is why it is important to understand the difference between an exchange, a brokerage service, an account with a provider, a self-custody wallet, and a hardware wallet.

Beginners are often confused by these distinctions. One person says they keep their cryptocurrencies "on an exchange." Another says they have them "in a wallet." Someone else sees a balance in an app and assumes they have full control over everything.

The essential question, however, is not only: where can I see my cryptocurrencies?

The right question is: who holds the keys?

Cryptocurrencies Are Not Stored in an App

With conventional money, such as euros, we are used to opening a banking app and seeing the balance in our account. That balance is not a bundle of banknotes stored in a vault specifically for us. It is an accounting record in the bank's system.

Cryptocurrencies work differently, although the experience may look similar to an ordinary user at first. You open an app and see the value of your portfolio. That alone does not mean that the cryptocurrencies are stored directly in the app.

Cryptocurrencies operate on blockchains. In simple terms, a blockchain can be viewed as a public ledger containing records of transactions and the balances associated with individual addresses. If you own Bitcoin, Ethereum, or another cryptocurrency, it does not mean that a coin is sitting inside your phone. It means that a record exists on the blockchain and can be controlled using the correct private key.

The app merely allows you to interact with the balance. It either displays an account held with a provider or serves as a tool for managing your own keys.

That is a fundamental difference.

For example, when you take a photograph with your mobile phone, the image is saved in the phone's memory. It genuinely exists as a file on your device. Cryptocurrencies do not work this way. They are not physically present on a device or stored in a folder. They are not files that you can copy from your phone to a USB drive.

In more technical terms, cryptocurrencies are associated with addresses on a blockchain, and moving them requires the corresponding private key. The blockchain makes it possible to verify the balance associated with a particular address. A wallet is a tool that enables users to manage the relevant keys securely.

The same applies to a hardware wallet. Cryptocurrencies are not physically stored inside it either. A hardware wallet primarily protects private keys—the means of authorising the transfer of cryptocurrencies.

Public Key, Private Key, and Address

To understand where cryptocurrencies actually are, it is necessary to explain three basic concepts: a public address, a public key, and a private key.

A public address can be compared to a bank account number. You can give it to someone so that they can send cryptocurrency to it. On its own, however, it does not allow anyone to control or transfer the cryptocurrencies.

A private key, by contrast, is sensitive information that makes it possible to sign transactions. Anyone who has the private key can send cryptocurrencies from the associated address. It must therefore be kept secure and should never be shared with anyone.

In simple terms:

The blockchain shows where cryptocurrencies are recorded.

A public address is used to receive cryptocurrencies.

A private key makes it possible to transfer cryptocurrencies.

A wallet helps manage these keys.

This is the origin of the well-known phrase:

"Not your keys, not your coins."

It can be understood as:

"If you do not control the keys, you do not truly control the cryptocurrencies."

This phrase does not mean that holding cryptocurrencies with a provider is automatically wrong. It simply means that users need to distinguish between a convenient account with a service provider and direct control over their own keys.

What Is a Cryptocurrency Exchange?

A cryptocurrency exchange is a platform where cryptocurrencies are bought and sold. Users may trade between traditional currencies, such as euros or US dollars, and cryptocurrencies, or exchange one cryptocurrency for another.

Exchanges often provide a wide range of features, including charts, trading pairs, trade histories, advanced order types, and tools for active trading. An exchange can be useful for experienced users, but its interface may be complicated and difficult to navigate for beginners.

If you buy cryptocurrency on an exchange and leave it there, you generally do not hold it in the same way as you would in your own wallet. You can see a balance in your account, but the exchange handles the technical custody of the cryptocurrencies.

This means that you rely on the provider. You rely on its security, rules, internal systems, service availability, and ability to let you access and use your cryptocurrencies.

This model can be convenient. Users do not have to protect private keys themselves, manage a seed phrase, or set up their own wallet. On the other hand, they do not have the same degree of direct control.

An exchange is therefore primarily suitable as a place for trading. It is not necessarily the ideal long-term storage solution for every user. The decision depends on the amount involved, the user's experience, their trust in the provider, and their willingness to assume personal responsibility.

What Is a Cryptocurrency Brokerage Service?

A cryptocurrency brokerage or conversion service is mainly designed to make buying and selling cryptocurrencies simpler. Compared with an exchange, the process is usually more straightforward. The user enters the amount they wish to buy or sell, the service displays an exchange rate, and the transaction is processed.

Such a service is often more suitable for an ordinary user who does not want to deal with trading charts, order books, or active trading. Its purpose is to simplify access to the world of cryptocurrencies.

Even here, however, it is important to understand what happens after the purchase.

The cryptocurrencies may remain with the service provider. In that case, the user sees their balance in an app or account, while the provider handles the technical custody and administration.

Alternatively, the cryptocurrencies may be sent to the user's own wallet. In that case, the user gains more control but also assumes greater responsibility.

The key distinction is therefore not only whether a purchase is made through an exchange or a brokerage service. The more important question is whether the cryptocurrencies remain with the provider or are held in the user's own wallet.

An Account with a Provider

Many people begin by creating an account with a cryptocurrency service provider, buying cryptocurrencies, and viewing them in an app. For a beginner, this is often the simplest option.

The main advantage is convenience. The user signs in with an email address and password, sometimes with two-factor authentication, and can see their portfolio. They do not immediately need to understand seed phrases, private keys, or the technical details of blockchain technology.

However, this model means that the user places trust in the provider. If the cryptocurrencies are held within an account operated by the service, the user typically does not have direct access to the private keys. The provider handles the technical custody of the assets, while the user has an account with the provider.

This is not automatically a bad arrangement. For some users, convenience, simplicity, and customer support are more important than complete technical independence.

It is nevertheless important to understand that this is a different model from using your own wallet.

An account with a provider offers easier access, but it also means relying on a third party. If the provider experiences a technical problem, temporarily restricts withdrawals, blocks an account for a security review, or encounters regulatory or financial difficulties, the user may not have full control over the situation.

This does not mean that custodial services are inherently bad. It means that users need to understand which model they are using.

Custodial and Non-Custodial Wallets

One of the most important distinctions in the cryptocurrency world is the difference between a custodial wallet and a non-custodial wallet.

A custodial wallet means that a third party manages the private keys. This may typically be an exchange, a brokerage service, or another cryptocurrency service provider. The user signs in to an account, and the provider handles the technical administration on their behalf.

A non-custodial wallet means that the user holds the private keys. The provider, exchange, or any other third party does not have direct control over those keys. The user has greater independence, but also bears greater responsibility.

The main difference is therefore not whether you use an attractive app or a complicated device. The main difference is who controls the private keys. In its educational materials, Kraken explains this distinction in terms of control over private keys: with custodial wallets, the keys are managed by a third party; with non-custodial wallets, the user is in control.

This is a basic principle that everyone working with cryptocurrencies should understand.

Advantages and Limitations of Provider Custody

Holding cryptocurrencies with a provider can be practical for beginners. Users have access to a simple interface, customer support, and often the ability to recover access to their account in much the same way as with other online services.

This is a significant advantage, particularly for people who do not want to deal immediately with the technical details of managing their own wallet.

At the same time, the user relies on a third party. That third party manages the keys, defines the rules of the service, and may be subject to regulatory requirements, security reviews, or internal procedures.

Several situations may arise with custodial services. A provider may temporarily restrict withdrawals. An account may be blocked pending a review. The service may face a cyberattack, insolvency, a technical outage, or a change in its rules.

Custody with a provider should therefore be understood as a trade-off.

On one side, convenience.

On the other, a lower degree of direct control.

In its comparison, Kraken notes that custodial wallets may be more convenient for beginners, but they also expose users to third-party risks, including security incidents, insolvency, regulatory intervention, or changes to the service.

Your Own Wallet

Using your own wallet means that you personally hold the information that provides access to your cryptocurrencies—not an exchange, a brokerage service, or another third party.

This gives you more control. You can send cryptocurrencies without requiring a provider's approval. You are not dependent on a single account or platform. You interact directly with the cryptocurrency network.

At the same time, you assume responsibility.

If you lose your seed phrase, nobody can recover it for you. If you send cryptocurrencies to the wrong address, the transaction generally cannot be reversed. If you fall for a scam and enter your seed phrase on a fraudulent website, you may lose your cryptocurrencies.

A self-custody wallet is therefore not merely a technical tool. It represents a transfer of responsibility.

With a bank or service provider, part of the responsibility rests with the institution. With your own wallet, a larger share of that responsibility rests directly with you.

This is unfamiliar to many people. Cryptocurrencies make greater financial independence possible, but that independence is not free. It requires basic knowledge, discipline, and caution.

Software Wallet

A software wallet is an application on a phone, computer, or in a web browser. It is practical, fast, and easily accessible.

It may be suitable for smaller amounts, everyday use, or a first introduction to self-custody. The user creates a wallet, records the seed phrase, and can receive or send cryptocurrencies.

The disadvantage is that a software wallet operates in an environment that may be vulnerable. A phone or computer can be infected with malware. The user may download a fake app, click a fraudulent link, or enter a seed phrase on a website pretending to be official customer support.

Basic security rules must therefore be followed.

Never photograph your seed phrase.

Never send your seed phrase by email.

Never store your seed phrase in the cloud.

Never enter your seed phrase on an unfamiliar website.

Never disclose your seed phrase to anyone claiming to be customer support.

A software wallet can be a good starting point, but for the long-term holding of larger amounts, a higher level of security may be worth considering.

Hardware Wallet

A hardware wallet is a physical device designed to manage cryptocurrency keys. Its primary purpose is not to "store cryptocurrencies inside the device," but to protect private keys outside the ordinary online environment.

This matters because an ordinary computer or mobile phone is connected to the internet, runs many applications, and may be vulnerable to malicious software. A hardware wallet helps reduce the risk by keeping sensitive keys separate from the online environment.

One of the best-known examples is the Czech company Trezor. The Trezor brand is operated by the Prague-based company SatoshiLabs, which states in its own materials that it created the Trezor Model One in 2014, described as the world's first hardware wallet.

A hardware wallet usually works by allowing a transaction to be prepared in an app but requiring it to be confirmed directly on the device. You check the address, amount, and other details on the device display. Only then do you physically confirm the transaction.

The purpose of this process is to ensure that the private key never leaves the device. In its educational materials, Trezor explains that a hardware wallet stores the private key offline and enables interaction with the blockchain without exposing the private key to the internet.

This does not mean that a hardware wallet eliminates every risk.

Secure handling of the seed phrase remains essential. If a user photographs the seed, stores it in the cloud, or enters it on a fraudulent website, the hardware wallet may not protect them.

A hardware wallet can significantly improve security, but it cannot save a user who personally discloses the main backup of their wallet.

What Is a Seed Phrase?

A seed phrase, sometimes also called a recovery seed or recovery phrase, is a set of words used as a backup for a cryptocurrency wallet. It most commonly consists of 12 or 24 words in an exact order.

These words are not an ordinary password. They are the key to recovering the entire wallet.

If your phone breaks, you lose your hardware wallet, or you purchase a new device, the seed phrase can be used to restore the wallet. However, if someone else obtains the seed phrase, they can restore your wallet as well.

That is why a seed phrase must never be treated casually.

With an ordinary password, a recovery option is often available. You click "forgotten password," receive an email, and set a new one. A self-custody cryptocurrency wallet does not work this way.

If you lose the seed phrase and also lose access to the wallet, access to the cryptocurrencies may be lost permanently.

If someone else obtains the seed phrase, the consequences can be just as serious.

The seed phrase is therefore one of the most important pieces of information in the entire cryptocurrency ecosystem.

I Can See a Balance in an App. Does That Mean I Really Own the Cryptocurrencies?

This is one of the most common questions.

The answer is: it depends on which app displays the balance.

If it is an app operated by a provider, such as an exchange or brokerage service, you are probably seeing a balance recorded in your user account. The provider handles the technical custody of the cryptocurrencies on your behalf. It is similar to an account with a financial institution. You have access to the service, but you do not usually manage the private keys directly.

If it is your own wallet and only you hold the seed phrase, the situation is different. In that case, you have direct control over the keys that make it possible to transfer the cryptocurrencies.

The difference is therefore not the app itself. The difference is who controls the keys.

Seeing a balance is not automatically the same as having full control.

Convenience Versus Responsibility

With cryptocurrencies, it is important to distinguish between convenience and responsibility.

Holding cryptocurrencies with a provider is more convenient. Users have customer support, easier access, a clear interface, and often the ability to recover access to their account. For beginners or smaller amounts, this may be a practical solution.

A self-custody wallet provides greater control. The user is less dependent on a single provider and has direct access to their cryptocurrencies. At the same time, however, they bear greater responsibility for security.

There is no single solution that is universally right for everyone.

Some people value the simplicity of a service and do not want to deal immediately with technical details. Others want their cryptocurrencies under their own control and are willing to learn how to use a wallet, protect a seed phrase, and follow security practices.

What matters is understanding which model you use and which risks are associated with it.

A Practical Example

Consider three different users.

The first user buys Bitcoin through a provider and leaves it in their account. They open the app, see the balance, and can later sell or send the cryptocurrency. It is simple and convenient. However, this user relies on the service provider.

The second user buys Bitcoin and sends it to a mobile wallet. They have their own seed phrase and greater control. However, they must keep the backup secure, protect their phone, and be careful with every transaction.

The third user holds Bitcoin for the long term in a hardware wallet. The private keys are separated from the ordinary online environment. This approach may be suitable for the long-term holding of larger amounts. However, the user must protect the seed phrase very carefully and understand what they are doing.

All three options may make sense.

The difference lies in the degree of convenience, control, and responsibility.

The Most Common Misconceptions

The first misconception is that cryptocurrencies are stored directly in an app. In reality, they are recorded on the blockchain, and the app merely allows users to interact with them.

The second misconception is that every app is a self-custody wallet. This is not necessarily true. Some apps display an account held with a provider, while others genuinely manage the user's own keys.

The third misconception is underestimating the importance of the seed phrase. Many beginners treat it like an ordinary password. In reality, it is the principal backup of the wallet.

The fourth misconception is that a hardware wallet removes all risks. A hardware wallet improves security, but it cannot protect users from their own carelessness.

The fifth misconception is that a cryptocurrency transaction sent incorrectly can simply be reversed. For most blockchain transactions, this is not possible.

The sixth misconception is that "I can see the balance" automatically means "I have full control." With cryptocurrencies, the question should always be: who holds the keys?

A Simple Way to Think About It

For beginners, it may be helpful to divide cryptocurrency use into three levels.

The first level is an account with a provider. It is simple, convenient, and suitable for an initial introduction. However, the user does not usually hold their own keys.

The second level is a self-custody software wallet. The user has greater control, but must be able to handle the seed phrase securely.

The third level is a hardware wallet. It is mainly suitable for long-term holding and larger amounts. It offers a higher level of security but still requires responsible behaviour.

The basic question is therefore not only:

Where can I see my cryptocurrencies?

A better question is:

Who holds the keys?

If the provider holds the keys, you rely on its service. If you hold the keys, you have greater control, but also greater responsibility.

Why This Matters

Cryptocurrencies were created in part to enable people to work with digital value without having to rely exclusively on a central authority. This is one of their greatest innovations.

However, this possibility also brings a new form of responsibility.

In the traditional financial system, we are used to mistakes often being handled by a bank, customer support, or a payment institution. With cryptocurrencies, this is not always the case. If you hold your own keys, you become your own bank to a certain extent.

This can be an advantage, but only if you understand the basic rules of security.

Understanding the difference between an exchange, a brokerage service, and a wallet is therefore one of the most important steps in the world of cryptocurrencies.

Conclusion

Cryptocurrencies are not stored on a mobile phone, computer, or directly inside a hardware wallet. They are recorded on a blockchain. Access to the cryptographic keys determines who can use and transfer them.

An exchange is a place for trading. A brokerage service simplifies buying and selling. An account with a provider offers convenience but involves relying on a third party. A self-custody wallet provides greater control but requires greater responsibility. A hardware wallet, such as one made by the Czech company Trezor, may be a suitable solution for more secure long-term cryptocurrency holding.

The most important distinction is not whether you can see a balance in an app.

What matters is who holds the keys.

If a provider holds the cryptocurrencies, you have convenient access through its service. If you hold your own keys, you have greater control over the cryptocurrencies. That control, however, also brings responsibility for security.

Understanding this distinction is a fundamental step towards using cryptocurrencies not merely as a number in an app, but with a genuine understanding of how they work.