--- title: "What Is a Seed Phrase, and Why You Must Never Share It" url: https://bkvpool.com/blog/what-is-a-seed-phrase/ date: 2026-10-28 author: Alex BKV category: Blockchain Basics --- # What Is a Seed Phrase, and Why You Must Never Share It A seed phrase is a list of 12 to 24 words that controls your crypto. Learn how it works, how to store it safely, and the scams that try to steal it. Imagine your phone falls into a lake. Your first thought is: "Is my ADA gone?" The answer depends on one question: do you still have the words? If you do, twenty minutes later, on a new phone, your wallet is back, with every coin in it. Those words are called a **seed phrase**. They are the most important thing you own in crypto, and most people learn about them in a hurry, during setup, with one finger ready to tap "Next". ## What is a seed phrase? A seed phrase (also called a recovery phrase or mnemonic) is a list of simple English words, usually 12, 15 or 24 of them. Your wallet app shows it to you once, when you create the wallet. Most wallets pick the words from a standard list of 2,048 words, defined in a public document called [BIP-39](https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki). Words like "garden", "rocket" or "salt". Cardano wallets usually use 15 or 24 words. Here is the key idea: **the words are your wallet.** The app on your phone is only a window. You can break the window, throw it away, or install a different app. As long as you have the words, you can open your wallet again from anywhere in the world. ## How can a few words hold my money? Your coins are not stored in your phone. They are recorded on the blockchain, the shared record book that thousands of computers keep. What you need is the right to move them. That right is a **private key**: a very long secret number. A long secret number is hard for humans to write down without mistakes. So the wallet turns that number into words. From the seed phrase, the wallet can calculate all your private keys and all your addresses again, every time, in the same way. The last word also contains a small check, like the last digit of a bank account number. If you write one word wrong, the wallet will usually notice that the phrase is not valid. ## Can someone guess my words? Not realistically. With 2,048 possible words in each position, a 24-word phrase has far more possible combinations than there are atoms in the whole Earth. Even a 12-word phrase has far more combinations than all the grains of sand on Earth. No computer today can try them all. So the danger is not guessing. The danger is that somebody **sees** your words. Almost every stolen wallet I have heard of was lost this way: through a photo, a fake website, or a "helpful" stranger. ## The golden rule Anyone who has your seed phrase has your money. Full stop. There is no bank behind a self-custody wallet. Nobody can freeze a theft, reverse a transaction, or reset your password. That freedom is the whole point of crypto, and it comes with this one responsibility. So: - **No real support person will ever ask for your seed phrase.** Not the wallet team, not an exchange, not a stake pool operator. I run a pool, and I will never ask you for it. - **Never type it into a website.** A real wallet only asks for it when you restore the wallet inside the app itself. - **Never send it in a chat or email,** and never save it in notes, cloud storage or a password manager that syncs online unless you really know what you are doing. ## Common tricks that steal seed phrases Scammers do not need to hack anything. They just ask nicely. Watch out for: 1. **Fake support.** You ask a question in a public Telegram or Discord group. Minutes later, a friendly "admin" sends you a private message and offers help. Real admins do not message first. 2. **Fake "wallet sync" or "validation" websites** that say your wallet needs to be updated, and ask for your words. 3. **Fake wallet apps** in app stores or from ads, with the same name and logo as a real one. 4. **Airdrop bait.** A message says you won free tokens. To claim them, you must "connect" by entering your phrase. If anything asks for your seed phrase outside of a normal restore, the answer is no. ## How to store it safely You do not need anything fancy. Most people are fine with this: - **Write it on paper, by hand.** Check every word twice. Keep the order. - **Make two copies** and keep them in two different safe places, for example at home and at a family member's home. A fire or a flood should not take both. - **No photos, no screenshots.** Phones back up photos to the cloud automatically. - For larger amounts, consider a **metal backup plate**. Paper burns and fades; steel does not. - Think about your family. If something happens to you, how would they find the words? Some people leave clear instructions in a sealed letter with a lawyer or in a will. ## Hardware wallets: a step up A **hardware wallet** is a small device, like Ledger or Trezor, that keeps your private keys offline. When you send ADA, the device signs the transaction inside itself, and the key never touches your computer or the internet. It is a good idea once your savings are big enough to hurt if you lose them. But it does not remove the seed phrase. A hardware wallet also gives you words during setup, and those words still need the same care. If the device breaks, the words bring everything back. ## What about leaving coins on an exchange? On an exchange, you do not have a seed phrase. The exchange holds the keys for you. That is easier, and some people prefer it. But you depend on that company staying honest and solvent. When the exchange FTX collapsed in November 2022, many customers could not get their money out. Many people keep a small amount on an exchange for trading and the rest in their own wallet. I wrote more about how wallets and exchanges see your activity in [Is Blockchain Private?](/blog/is-blockchain-private/), and about first steps with a Cardano wallet in [Onboarding Cardano](/blog/onboarding-cardano/). ## The honest downside Self custody is not for everyone, and it is fair to say so. If you lose your seed phrase and your device at the same time, your coins are gone forever. Nobody can help. There are no reminders and no second chances. This sounds scary, and it is meant to. The good news is that the habits are simple. Write the words down, keep them offline, keep two copies, and never show them to anyone. Do that, and you are already safer than most people in crypto.
One more small thing, only if you hold ADA. Staking never needs your seed phrase: you delegate from inside your own wallet, and the coins stay there. If you are looking for a pool, [BKV](https://bkvpool.com/#delegate) runs with a 0% margin and would be happy to have you. You can also give your voting power to my DRep, **Alex BKV**, on [cardanodrep.org](https://cardanodrep.org/). And if you prefer a different pool or DRep, that is completely fine: any honest pool and any active DRep make Cardano stronger.