How to keep your crypto off an exchange

Analysis reviewed on September 7, 2026. The price is checked separately and carries its own date.

Before we recommend any device, here is the question almost nobody asks you before selling you one: what will it protect you from, and what will it not? Plenty of people who arrive looking for a hardware wallet would get more out of that money spent on something else.

Where to buy them

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The decision, in five seconds

And a warning that does not come with the product: self-custody moves the risk, it does not remove it. You stop depending on a company not going under and start depending on yourself not losing a sheet of paper. What it will not protect you from, further down.

What we have analysed

What it will not protect you from

A hardware wallet keeps your private key inside a device that never hands it over: the transaction is signed inside and comes out signed, so the key never touches the computer, not even an infected one. That solves one very specific problem — somebody copying it from a distance — and none of the others:

• It does not protect you from signing something malicious. If you are tricked into authorising a transaction and you confirm it on the screen of the device, the device signs it. That is where most of the money lost today goes, and no maker closes that door.
• It does not protect you from losing the recovery backup. Those 12, 20 or 24 words are your money. The device is a replaceable remote control.
• It does not protect you from yourself. An address pasted wrong, the wrong network, a transfer to a contract that gives nothing back: you sign that yourself, and it cannot be undone.

What the Spanish tax office makes of it when you move your coins out

This is the part that does not come in the box, and the one that raises the most doubts when somebody decides to move their balance.

Moving your crypto from an exchange to a wallet of your own is not a taxable event. It is not a disposal: you are not selling, you are not swapping and the composition of your assets does not change, so there is no gain or loss to declare. You still hold the same thing, somewhere else. That is why our tax calculator does not touch your purchase queue when you record a withdrawal: moving consumes nothing.

What does change is form 721, and it changes in your favour. That reporting form applies to anyone holding crypto in the custody of entities outside Spain above €50,000 on 31 December. In self-custody there is no entity keeping your keys, so that balance does not count towards the 721. Mind the catch: if you leave half of it on a foreign platform, that half still counts.

And what does not change: when you sell, the gain is worked out from the price you paid, oldest first. Passing through a wallet of your own resets nothing and erases no history. Wealth tax, where it applies, does not tell one storage place from another either.

Frequently asked questions about storing crypto