Custodial and non-custodial wallet: key differences you should know

Custodial and non-custodial wallets: the illusion of ownership and real risks

What is a crypto wallet and how does it work?

Before understanding the difference between custodial and non-custodial crypto wallets, it is necessary to understand how they work. A crypto wallet is simply a set consisting of a linked pair of keys, where one key provides access to the other.

Any wallet, custodial or non-custodial, consists of two keys:

Public or open key — the address or unique identifier of the wallet;
Private or secret key — the password to the wallet that allows spending cryptocurrency from a specific address. The private key is used to sign transactions, and the public key is derived from it.

The public key can be shared — it is required to receive cryptocurrency into a custodial or non-custodial wallet.

However, leakage of the private key may result in the loss of digital assets, since it provides full control over the funds in the wallet.

Differences between custodial and non-custodial wallets

The concept of a "non-custodial wallet" is closely related to the traditional financial sector and means the absence of a custodian — a financial institution or service that provides safekeeping of assets.

This is the key difference between custodial and non-custodial wallets. A non-custodial wallet is a personal safe, the keys to which are controlled solely by the user.

In custodial wallets, cryptocurrency storage is handled by a third party acting as an intermediary between the user and their assets. In other words, the user of a custodial wallet delegates control of their digital assets to a custodian, receiving only limited access to them. Custodians may include depositories, banks, exchanges, brokers, and other financial organizations.

Examples of custodial wallets include exchange accounts accessed via a standard username and password. In custodial wallets, users can conduct transactions only within the service of a specific company, and the cryptocurrency itself is stored in the company's accounts.

Non-custodial wallets can be either software-based or hardware-based — physical devices that protect private keys from leaks. Software wallets are also called "hot" wallets because they require a constant internet connection to operate. These include mobile, desktop, and browser wallets.

"Cold" wallets refer to hardware wallets, as they provide offline cryptocurrency storage and allow access to certain functions, such as viewing balances and transaction history, without an internet connection.

Pros and cons of custodial and non-custodial wallets

Custodial and non-custodial wallets differ in terms of ease of creation and use. To create a custodial wallet, you only need to register an account. After authorization, all operations within the user's account are performed without additional confirmation. This convenience, in turn, reduces the risk of errors when conducting cryptocurrency transactions.

Creating a non-custodial wallet is a more complex and responsible process. During setup, the user must ensure privacy to prevent leakage of the private key and also ensure backups. If the user loses the private key, they may also lose access to their assets. Each transaction in a non-custodial wallet requires confirmation via a digital signature.

In terms of storage approach, custodial and non-custodial wallets have the most significant difference. Among experienced digital asset users, the phrase "not your keys — not your crypto" is common. This expression fully reflects the essence of custodial wallets.

At the same time, this principle is also a drawback of non-custodial wallets, since if a user loses their private key, no third party can help restore access to the digital assets.

Although custodial wallets create a stronger illusion of storage, in the event of asset loss due to errors or theft, an exchange (or other organization) may assist in recovering funds or provide compensation. However, it may also restrict user access to their own assets at any time. In addition, there is a risk of encountering fraudulent exchanges and services from which it will be impossible to withdraw your cryptocurrency.

Custodial wallets provide access to additional financial services such as interest-bearing deposits, launchpools and launchpads, staking, farming, and cloud mining. However, all services are provided within the closed ecosystem of a single platform, which is a disadvantage of custodial wallets.

Non-custodial wallets are not limited to a single ecosystem and provide access to a wide range of services in the decentralized finance (DeFi) market. This is another key difference between custodial and non-custodial wallets.

Another difference between custodial and non-custodial wallets lies in privacy. Custodians most often require identity verification in accordance with KYC ("Know Your Customer") rules, without which access to operations may be restricted.

Non-custodial wallets, on the other hand, can be used anonymously. Moreover, there are special services designed to enhance transaction privacy, such as crypto mixers.

In terms of security threats, both custodial and non-custodial wallets have their own pros and cons. Providers of non-custodial wallets do not have access to users' private keys, meaning that hacking their services does not threaten clients' cryptocurrency holdings. Users of custodial wallets, however, may lose funds due to hacks of exchanges or services.

At the same time, users of both custodial and non-custodial wallets are equally vulnerable to phishing. Therefore, in both cases, additional protection methods should be used, such as two-factor authentication, multisignature, passwords, passphrases, and other security measures.