Where to store your crypto? Platform, third party, hot wallet or cold wallet

01Storing crypto: it all comes down to private keys

Despite its name, a crypto wallet does not contain your crypto. It stays recorded on the blockchain. The wallet holds what allows you to move it: your private keys.

Whoever holds the private key can send the associated crypto anywhere, with no way back. That is why choosing where to store your crypto comes down, above all, to choosing where your keys live.

When you create a wallet, you receive a recovery phrase (seed phrase): usually 12 or 24 words in a precise order. It lets you recreate your keys on any compatible device. Write it down offline, and never photograph or share it: anyone who knows it can access your crypto, and nobody can reset it for you if you lose it.

Hence the distinction between the four options: either a provider holds the keys for you (platform or third party), or you hold them yourself (hot or cold wallet). The first case is called delegated custody, the second self-custody.

02Option 1: leave your crypto on the platform

This is what most beginners do, often without realising it. After a purchase, your crypto stays in your account: the platform holds the keys and keeps them for you. You access it with your login details, like an online account.

What it means for you:

• Nothing to manage: no recovery phrase to back up, no device to buy.
• Selling or swapping is immediate, since your crypto is already there.
• You depend on the platform to access your crypto and withdraw it.

Under MiCA, this service is called “safekeeping and administration of crypto-assets on behalf of clients”. Article 75 of the regulation requires a platform authorised for this service to keep your assets separate from its own and to maintain a record of each client's positions. In the event of insolvency, the assets held in custody are not part of its estate. Check that custody is covered by its authorisation.

03Option 2: entrust your crypto to a third party

You can also entrust your crypto to a provider separate from the one where you buy it. There are two cases:

• A specialist custodian: it holds your crypto on your behalf, without managing it. It is the same MiCA service as custody on a platform, offered by a firm whose main business it is.
• An asset manager: it holds your crypto and also makes investment decisions for you, according to an agreed strategy. Under MiCA, this service is called “portfolio management of crypto-assets” (Article 81): the provider must check that the service suits you before starting, and send you regular statements.

As with a platform, you do not hold the keys: you rely on the third party, whose authorisation must cover the service provided.

04Option 3: the hot wallet, your current account

A hot wallet is a crypto wallet whose keys are stored on a device connected to the internet: a mobile app, a browser extension or software on a computer. Like a current account, it is used for everyday operations: receiving, sending, using decentralised applications.

What it means for you:

• It is quick and free to install. A few minutes are enough to create a wallet.
• You hold your keys: nobody can block your crypto, but nobody can recover it for you in case of a mistake.
• The keys are exposed to the risks of the device: malware, fake websites, a stolen or compromised phone.

The rule that follows: in a hot wallet, keep what you would accept carrying in your pocket when you leave home, not your savings.

05Option 4: the cold wallet, your safe

A cold wallet keeps your private keys offline. The most common form is the hardware wallet: a small dedicated device, similar to a USB stick, which signs transactions without ever exposing the keys to the computer or phone it is plugged into. Like a safe, it is used to keep for the long term what you do not touch often.

What it means for you:

• Your keys never touch the internet. An attacker who takes control of your computer cannot read them.
• Every transfer is confirmed physically, on the device itself. Operations therefore take more steps.
• The device has a price, and it must be bought from the manufacturer or an official reseller, never second-hand.

Losing or breaking the device does not mean losing your crypto: the recovery phrase lets you restore it on a new device. It is the phrase, not the device, that must be protected like the contents of a safe.

06Hot and cold wallets under the regulation

Personal wallets are not services regulated by MiCA: the regulation specifies that providers of non-custodial wallet software or devices fall outside its scope. The transfer from a platform to your wallet, however, is regulated: when you withdraw more than €1,000 of crypto to your own wallet, the platform must verify that the address belongs to you.

07Where to store your crypto: the comparison table

08Which option to store your crypto?

• You are starting with small amounts and want to be able to sell easily: the platform avoids any key management, provided it is authorised for custody.
• You want to manage neither your keys nor your investments: a third party, custodian or asset manager, takes over.
• You make frequent transactions or use decentralised applications: a hot wallet, with limited amounts.
• You hold your crypto for the long term and want to be its sole keeper: a cold wallet.

These options are not mutually exclusive. Many holders combine, for example, a platform to buy, a hot wallet for everyday use and a cold wallet for savings.

09Frequently asked questions

10Before choosing where to keep it, choose where to buy

Whether you keep your crypto on the platform, with a third party or in your own wallet, everything starts with where you buy it. The Uncrypt Comparator shows, for each platform, its type of provider, its MiCA authorisation status, the authority that granted it and a link to the official register. No ranking: verifiable facts, side by side.

• Comparator: authorised platforms side by side, filterable by country.
• Buying your first bitcoin in Europe: the step-by-step guide.
• Exchange, broker or custodian: who sets the price, who holds your crypto-assets.