How to Store Your Seed Phrase

Your "seed phrase" is a sequence of 12 or 24 words that generates every private key your Bitcoin wallet will ever use. Anyone who has those words can spend your bitcoin, so secure storage of your seed phrase is paramount.

If you want to understand what a seed phrase is from a technical perspective, What is a Bitcoin Seed Phrase? covers this in greater detail.

How Do I Write Down My Seed Phrase?

When you initially set up your hardware wallet, it generates a seed phrase and displays each word on screen in numbered order. You must write every word down before you confirm. The order of the words matters, and a single transposed or misread word means the backup fails when you need it.

During setup:

1. Write each word in numbered sequence. Number 1 through 12 or 1 through 24, exactly as displayed.

2. Write clearly and legibly. An "n" that looks like an "m" or a "t" that looks like an "f" can cause a recovery failure. If your handwriting is ambiguous, then it is best to print.

3. Confirm each word carefully. Each of the 2,048 BIP39 words is uniquely identified by its first four characters, so if you have any doubt, cross-reference the first four letters against a BIP39 word list.

4. Complete the device quiz. Your hardware wallet will prompt you to re-enter specific words in a random order before proceeding. Pass it before you continue.

Coldcard devices display each word individually and require you to confirm the words on the device before advancing. You cannot advance without acknowledging the words.

There are several things you must never do with the seed phrase.

1. Never type it into a computer keyboard.
2. Never photograph it.
3. Never store it in a notes app, a password manager, cloud storage, or any service that transmits data to a remote server.
4. Never share it with anyone.

A digital copy of your seed phrase is accessible to malware, cloud providers, data breaches, and anyone with access to your device or account. If someone is able to access or even view your seed phrase, they can take all your bitcoin.

Should I Use Paper or Metal for My Seed Phrase Backup?

Most hardware wallets ship with a paper card with numbered lines for you to write on. Paper is cheap and convenient, and for a test wallet or a temporary backup during initial setup, paper works just fine.

For a savings wallet holding significant funds, paper is not a good long-term solution.

• Fire: Paper ignites at approximately 233°C and residential structure fires often reach 600 to 1000°C. A paper backup stored inside a steel filing cabinet or home safe can still reach temperatures well above paper's ignition point in a serious fire.

• Water: Water and high-humidity can ruin a paper seed phrase over time. A burst water pipe, a flooded basement, or a storm surge can destroy a paper backup entirely, with no warning and no recovery.

• Degradation: Paper simply degrades over time. It yellows, becomes brittle, and ink fades, reducing legibility with each passing year.

A "metal backup" is a stainless steel plate or set of tiles with the seed phrase words stamped, engraved, or punched into the surface permanently. Grade 304 stainless steel melts at approximately 1,400°C, is essentially impervious to water, and does not degrade if stored properly.

The choice between paper and metal comes down to how much bitcoin you are holding and for how long. Paper works for small amounts and test environments, but metal is for savings and large holdings. Coinkite has metal backups for both 12 and 24 word seed phrases.

Paper vs Metal Seed Phrase Backups covers the comparison in full, including the specific properties of different metal backup products. How to Choose a Metal Seed Backup covers product selection.

How Many Copies Should I Make and Where Should I Store Them?

The number of seed phrase copies needed depends on your setup. A singlesig wallet has one seed phrase to protect, whereas a multisig wallet has one seed phrase per signing device. This means a 2-of-3 setup has three separate seed phrases, each requiring its own backup.

One rule applies regardless of your setup: never store a signing device and its seed phrase backup in the same location. If both are in the same place, a single theft or disaster takes both simultaneously, leaving nothing to recover from.

Singlesig Seed Phrase Backups

A single backup is a single point of failure. A burglary, fire, flood, or accidental disposal could permanently end your access to the funds it protects. Two copies at two geographically separate locations is the minimum standard for a savings wallet.

• Primary copy (home). A home safe that is bolted down or well-hidden, a fireproof lockbox, or a location not obvious to a visitor. A bolted safe resists removal, and a fireproof rating adds protection on top of what a metal backup already provides.

• Secondary copy (off-site). A bank safety deposit box offers strong physical security and protection against home-specific disasters, with the only limitations being access hours and a small institutional risk. A secured location at a trusted family member's home works if they have adequate physical security and live separately from you. A second property you own is another option.

Multisig Seed Phrase Backups

Each seed phrase in a multisig setup needs its own backup, following the same two-location minimum. The additional consideration is quorum accessibility. Your backups need to be distributed so that no single disaster takes out two of them simultaneously, while still being realistically reachable when needed. Multisig wallets also require a separate wallet descriptor backup, which you can learn about in What is Bitcoin Multisig?.

No single location should hold two or more seed phrase backups, as this recreates a single point of failure and gives anyone who finds that location effective control over the wallet.

Seed Phrase Storage and Physical Security covers location evaluation in full, including the physical threat landscape and what each storage option protects against.

How Do I Test That My Seed Phrase Backup Actually Works?

The recovery test is the single most important step many new hardware wallet users skip. Writing a word down incorrectly, writing it in the wrong order, or misreading a character are all errors invisible until recovery is attempted.

The test sequence is as follows:

1. Generate your seed phrase on the device and write it down on physical media.
2. Send a small test amount to a receive address on the wallet.
3. Factory-reset the device, or delete the wallet entirely.
4. Restore the wallet from your written seed phrase only.
5. Verify that the device generates the exact same receive address from step 2. If a different address appears, the backup contains an error.
6. Confirm the test amount is visible and unspent.
7. Send a small amount out to a different address to verify spending works.
8. Receive it back.

Only after completing all eight steps above should you deposit significant holdings.

Step 5 is the critical point in the process. The same seed phrase must produce the same keys and therefore the same addresses every time. If the restored wallet generates a different address, something went wrong during transcription, and the test catches this before real funds are at stake.

The reason to factory-reset the device is not because it is damaged but to confirm that the written words alone are sufficient to reconstruct the wallet in its entirety.

Run this test before trusting the backup with any significant amount, and annually thereafter.

What Else Should I Know About Long-Term Seed Phrase Security?

Creating and testing a backup is the start of a security practice, not the end of it.

Annual or semi-annual verification. Once or twice per year, confirm that your physical backups are still readable. Check that the words are legible, that the medium has not deteriorated, and that the backup generates the correct receive address. A full recovery test annually is the best practice for any significant savings wallet.

Passphrase. A "passphrase" is an optional word or phrase that is combined with your seed phrase during key derivation to produce a completely separate wallet. The same 24 words plus a passphrase generate entirely different keys than the same 24 words without one.

If someone finds your seed backup, the passphrase-protected funds remain inaccessible, as they only have half the combination. The passphrase is not stored on the device, so it must be backed up separately, at a different location from the seed phrase. Managing a passphrase correctly has risks. What is a Bitcoin Passphrase? covers the full picture before you decide whether to use one.

Inheritance. Establishing and updating your inheritance plan is vital to ensure your heirs can receive your bitcoin in the event of your death or incapacitation. They need instructions for how to use it, the wallet type, any passphrase, and ideally a trusted technical contact who can help them navigate the recovery. A seed phrase found by a non-technical heir without instructions is not a complete inheritance plan. Bitcoin Inheritance Planning covers the practical frameworks.

Backup mistakes. The most common errors in this category are photographing the seed phrase, keeping only one copy, storing paper in a location without fire protection, and never testing recovery. Common Bitcoin Backup Mistakes covers the full list with explanations of why each matters.