Seed Phrases and Hardware Wallets, Explained

Updated 2026-10-29

Short answer: your seed phrase (12 or 24 words) is your wallet. Anyone who has it can take everything, from anywhere, and no one can reverse it. Write it on paper (or metal), keep it offline in a place only you can reach, and never type it into anything except the wallet you are restoring. A hardware wallet keeps your keys on a small device, so even a hacked computer can't sign for you.

What a seed phrase is

When you create a wallet, it shows you a list of 12 or 24 ordinary words. Every account and key in that wallet is worked out from those words, on every chain the wallet supports. That is why:

The same words restore your wallet in any compatible wallet app, on any device, years later.
Losing the device doesn't lose your coins, as long as you have the words.
Losing the words (and the device) means the coins are gone for good. There is no "forgot password" in self-custody.
Anyone who sees the words can restore your wallet on their own device and empty it. You won't get a warning.

Your wallet app also has a password or PIN. That only unlocks the app on that one device. The seed phrase is the real key.

How to store it

Write it by hand on paper, in order, and check every word against the screen. Many people later copy it onto a metal plate that survives fire and water.
Keep it offline. Not in a photo, a screenshot, a notes app, an email to yourself, a password manager you sync, or a cloud drive. Anything online can be copied without you knowing.
Keep it private and safe from accidents. A locked drawer or a home safe is common; some people keep a second copy in a different place, such as a safe deposit box, in case of fire.
Don't split it into halves in two places. Half a phrase makes it much easier to guess the rest. If you want a backup that tolerates losing one copy, keep a full second copy instead.
Plan for your family. Write down, somewhere they will find it, that you hold crypto and where your instructions are. Not the phrase itself.

Some wallets offer an optional extra word or passphrase on top of the seed phrase. It adds protection, but if you forget it, the coins are lost exactly as if you'd lost the phrase. Use it only if you're sure you can keep both safe.

What a hardware wallet does

A hardware wallet (Ledger, Trezor and others) is a small device that keeps your keys inside it. When you send or sign something, your computer prepares the transaction, but the device shows it on its own screen and signs it only after you press its buttons. The keys never leave it.

That protects you from the most common way people lose crypto: malware or a fake website on the computer. Even if the computer is compromised, it can't sign without the device in your hand.

It's worth it once your crypto is worth more than the device, roughly $80 to $200.

Buy only from the maker's own website, never second-hand or from a marketplace seller.
Set it up yourself. It creates a new seed phrase for you to write down. A device that arrives with words already printed on a card is a scam: whoever wrote the card controls the wallet.
Read the device's screen, not the computer's. Check that the address and amount on the device match what you meant to do. If the device says it can't show the details ("blind signing"), stop and find out why.
Update its software only through the maker's official app.
Keep the seed phrase away from the device, not in the same box or bag.

The scams that go after your seed phrase

Every one of these ends the same way: the words reach a stranger, and the wallet is emptied.

"Support" that contacts you first on Discord, Telegram, X or email. Real support never asks for your seed phrase, ever.
Sites that ask you to "validate", "sync", "recover" or "unlock" your wallet by typing the words. No real service works this way.
Airdrop or reward claims that need your phrase. Real claims only ask you to connect a wallet and sign.
Fake wallet apps and browser extensions, often bought as search ads. Install only from the wallet's official site or your phone's official app store.
Letters or emails "from" a hardware wallet maker saying your device needs a new phrase. Customer lists have leaked before; the makers never ask.
Someone offering to help over screen-share. They only need to see the words once.

If your phrase may have been seen

Act straight away, because whoever saw it can act too:

Create a new wallet with a new seed phrase (on a hardware wallet, if you have one).
Move everything to the new wallet's address, the most valuable first.
Check the old wallet for anything left over, such as staked coins or rewards, and move those too.
Stop using the old wallet and its phrase.

Do this

Write your seed phrase on paper, check it, and keep it offline.
Never type it anywhere except when you restore your own wallet.
Get a hardware wallet once your crypto is worth more than one, from the maker's own store.
Read what you sign on the device's screen. Our guide on reading a transaction before you sign explains what to look for.
Treat anyone who asks for your words as a thief, however official they look.