The 25th Word: A Secret Vault in Your Ledger Signer

Whether you own a Ledger signer or use a non-custodial wallet, you are likely familiar with the famous 24 recovery words. They are the cornerstone of access to your cryptocurrencies. But did you know that a 25th word exists? Most people are unaware of it or never use it, yet it could significantly enhance your security. This additional word acts as a secret key that opens a completely independent wallet, hosted on the same small device. It is called the << passphrase >>. Let's discover together, in simple terms, how it works.

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What is this famous << 25th word >>? {#h-what-is-this-famous-25th-word}

When you initialize a new wallet, your Ledger signer automatically generates a series of 24 words, randomly drawn from a list of 2048 words (the BIP-39 list). These words are not just a simple password: they are the << seed >> of your digital wallet (for those who love technical details, we explain how it works here). It is from these words that the device calculates all your addresses (the ones you share to receive funds) and your public and private keys (the ones that allow you to spend your tokens).

Whoever holds the 24 words has full control over all tokens associated with the accounts that derive from them. They can transfer or spend them wherever they wish without your consent. That is why this list is the most valuable asset to protect. Fake seedphrase

Beyond the 24 automatically generated words, Ledger gives you the freedom to add an extra layer of protection: a word of your choice. Unlike the first 24, which must be drawn from the BIP39 list, this 25th word is not subject to any imposed rules.

You are free to put whatever you want: a simple word, a full phrase, or even a random mix of letters, numbers, and symbols. The only limit is the size: up to 100 characters. The longer, more original, and harder to guess your word is, the more your hidden accounts will be protected against potential attacks (feel free to use a robust password generator).

No Impact on Your Current Accounts {#h-no-impact-on-your-current-accounts}

Activating this 25th word does not change your original wallet (the one created with the 24 words). The addresses, private keys, and all tokens remain exactly where they are, perfectly accessible and unchanged.

In reality, this additional word generates an entirely new set of accounts, equipped with brand new addresses and an initially empty balance. It’s like unlocking an additional digital vault, completely blank, next to your main vault.

To make these new addresses useful, you need to manually send cryptocurrencies to them from your standard accounts (or from an exchange). Nothing transfers automatically: your accounts based solely on the 24 words and those protected by the combination << 24 words + 25th word >> evolve in parallel, never crossing paths, unless you actively decide to make them communicate through a voluntary transfer. Ledger Range Models

Why is this 25th word so practical? {#h-why-is-this-25th-word-so-practical}

1. An additional layer of security: with this system, your 24 words alone are no longer enough to reveal everything. If someone gets hold of them by any means (for example, see the recent technical issue with the Coldcard wallet), they will only be able to access the accounts linked to it. They won't even see the existence of your accounts hidden behind the 25th word. To access those, they would absolutely need both: your 24 words AND your personal secret word. It's a double-layer security.
2. The << decoy account >> effect: many people use this trick to separate their everyday money from their long-term savings. They keep a small amount of cryptocurrencies in the standard account (accessible with the 24 words) for their daily expenses and place the bulk of their wealth behind the 25th word. Thus, if one day someone forces you to unlock your Ledger signer (as is increasingly the case in France), they will only see the small account, and your precious savings will remain hidden in their stash.
3. Custom organization: you are not limited to a single 25th word. You can create several, each time creating a new series of addresses! Imagine: one word for your savings accounts, another for your << risky >> funds, and a third for family. Each word opens up a world of accounts completely isolated from the others.

The Two Ways to Use the 25th Word on Your Ledger Signer {#h-the-two-ways-to-use-the-25th-word-on-your-ledger-signer}

Ledger has thought of everything to make it convenient. You have a choice between two methods. In both cases, you enter your 25th word directly on the device (and never on your computer, to avoid viruses).

To access these options, go to Settings > Security > Passphrase on your signer. You can then choose between << Set temporary passphrase >> and << Set passphrase and attach it to a new PIN >>. Creating a passphrase on a Ledger Flex signer

The Second PIN Code Method {#h-the-second-pin-code-method}

This is the most comfortable for daily use. You associate your 25th word with a second PIN code on your signer. When you turn on your Ledger:

• You enter your usual PIN (e.g., 1234) → you access your standard accounts.
• You enter your secondary PIN (e.g., 5678) → you go directly to your hidden accounts.
  It's like having two different entrances for two distinct apartments in the same building.

The Temporary Method (or << on demand >>) {#h-the-temporary-method-or-on-demand}

You enter your secret word each time you want to access your hidden accounts. As soon as you turn off your Ledger, it forgets this word and automatically returns to your standard accounts. This is ideal for occasional use that doesn't even leave a trace in the secure chip of the signer. It can be a bit cumbersome for regular use since entering the 25th word can be lengthy if your password is complicated.

Practical Note: For now, Ledger does not allow you to associate multiple different passphrases with multiple distinct PINs. You can only link one passphrase to a single secondary PIN. If you want to use multiple 25th words, you will have to go through the << temporary >> method (manual entry each time) for the others, which is a bit less comfortable on a daily basis. Hopefully, Ledger will integrate this feature in a future generation of its signers, as it would greatly simplify the management of multiple hidden accounts.

The Big Warning Not to Forget {#h-the-big-warning-not-to-forget}

This system is great, but it carries a huge risk: if you forget your 25th word, it's permanent. Just like the first 24 words, Ledger does not save it anywhere. If you confuse an uppercase letter with a lowercase one, or if you forget a digit, your hidden accounts become permanently inaccessible. No one will be able to retrieve them for you, not even Ledger.

You must therefore keep it with the same caution as your 24 words. Never share it with anyone, never type it on a device connected to the internet, and write it down carefully with clearly legible letters. Store this backup in a safe place, preferably separate from the 24 words. Conversely, if you fear losing your 24 words, the Ledger Recover service can save an encrypted copy of them. However, be careful: Recover only supports the 24 words, never your passphrase. The 25th word remains entirely your responsibility, and that is precisely what ensures that your hidden accounts remain inaccessible, even through a third-party backup service.

For more tips on keeping your seed phrase secure, we recommend reading this article.

Forget the simple vault: the 25th word is the double door, the false trail, the account that no one suspects. A bit of discipline, and your savings sleep in the shadows, safe from the gaze of even your 24 words. So, are you ready to take the plunge?