If you own crypto and plan to use a hardware wallet for long-term storage, this guide walks through seed phrase setup from first power-on to hardened backups. I test hardware wallets regularly and write from hands-on experience. What I've found is that small setup mistakes cause big headaches later. This guide is useful for beginners who want a safe first setup and for intermediate users deciding between single-sig or multisig, passphrase or not.
Who should look elsewhere? If you want a custodial or exchange solution (someone else holds the keys for you), this guide may be overkill. Also consider a multisig strategy if you expect to store institutional amounts (see the multisig guide linked below).
(See related setup guides: Full setup guide • Restore and recovery • Multisig guide)
A seed phrase is a human-readable list of words that encodes the mathematical secret needed to derive your private keys. The most common standard is the BIP-39 seed phrase. In plain terms: the words are not a password — they are the master key.
Why does word count matter? Because entropy matters. A 12-word BIP-39 seed phrase typically encodes 128 bits of entropy; a 24-word BIP-39 seed phrase encodes 256 bits (higher entropy = higher brute-force resistance). Both formats are widely supported, but the longer phrase adds an extra margin of safety for long-term cold storage.
In my experience, once you understand that the seed phrase equals the account, decisions get easier. Keep it offline. Always.
Image:
And yes, always test a restore on a secondary device or emulator before you trust a single backup.
When you reach the recovery phrase page, expect one or two verification steps. The device will either ask you to enter a word index ("what was word 7?") or to tap/select words in order. This is how the device confirms you copied the phrase correctly.
Do not sign transactions or connect the device to unfamiliar software until you finish verification and a firmware check. In my testing, skipping this step is one of the most common mistakes.
| Words | Typical entropy | Pros | Cons | Recommended for |
|---|---|---|---|---|
| 12 | ~128 bits | Faster to write and verify; good compatibility | Lower entropy compared with 24 words | Everyday users storing moderate amounts or new users who need convenience |
| 24 | ~256 bits | Stronger brute-force resistance; better long-term security | Longer to write/verify; slightly more error-prone during setup | Long-term holders, high-value cold storage, inheritance plans |
Which should you pick? If your holdings justify extra effort, choose 24 words. If you prioritize speed and convenience for lower balances, 12 words is acceptable. I believe many users will find 24 words worth the one-time inconvenience.
Paper backups are common but fragile (fire, water, mold, theft). A seed phrase metal backup (steel plate) resists heat and moisture and is the preferred long-term option for many serious holders. But metal backups cost extra time to assemble and store securely.
Alternative: SLIP-39 (Shamir backup) splits the recovery into multiple shares so you can distribute risk geographically. This method can improve resilience but has trade-offs: fewer wallets support SLIP-39, and managing shares adds complexity. See the detailed SLIP-39 guide: slip39-shamir-backup and a seed backup plate primer: seed-backup-plates.
But don’t confuse physical durability with operational security. Keep backups in separate secure locations (bank safe deposit box, trusted family safe). And never store a photo of your seed phrase.
A passphrase (often described as a 25th word) adds a secret that modifies the derived accounts. It provides plausible deniability and extra security, since the base seed phrase without the passphrase won’t reveal the same accounts. However, if you lose or forget the passphrase, recovery becomes impossible. I’ve seen users lock themselves out by choosing obscure phrases and not recording a robust hint (do not store the passphrase with the seed phrase!).
Multisig is another route to higher security. Instead of a single seed, multiple keys (across devices or custodians) are required to spend funds. Multisig reduces single-point-of-failure risk and is worth learning for larger balances. See multisig-for-ledger for an overview.
Common mistakes I see:
What happens if I lose seed phrase? If you truly lose your only seed phrase and have no other backup, access to the funds is permanently lost (unless you used custodial services or set up multisig beforehand). That’s why redundancy matters. See the restore guide: restore-recovery-phrase and recovery scenarios: recover-if-device-lost.
And remember: test your restore process on a spare device before you move large sums.
Q: Can I recover my crypto if the device breaks?
A: Yes — as long as you have your seed phrase (and passphrase, if used). Use the restore process on a compatible hardware or software wallet. See restore-recovery-phrase.
Q: Is Bluetooth safe for a hardware wallet?
A: Bluetooth increases the attack surface. For routine small transfers it can be convenient; for large cold storage transfers consider USB/OTG or air-gapped workflows. Read more: bluetooth-usb-nfc-security.
Q: Should I use a 12 vs 24 word seed phrase?
A: See the comparison table above. 24 words are better for long-term, high-value storage. 12 words are more convenient for everyday use.
Q: Is passphrase the same as the 25th word?
A: The passphrase concept is often described as a 25th word, but it can be any string. Treat it like a separate secret; losing it means losing access.
Q: What happens if the company behind my hardware wallet goes bankrupt?
A: Your seed phrase still controls your funds. Company insolvency affects firmware support and apps, but not the underlying private keys. See more: company-bankruptcy-what-happens.
Seed phrase setup is a one-time effort that protects you for years. Take the time to choose 12 vs 24 words intentionally, verify on the recovery phrase page, and invest in a durable backup (seed phrase metal backup if you plan long-term storage). In my testing, these steps eliminate most common recovery problems.
Ready to set up or restore? Follow the full setup and restore guides: Full setup guide • Restore step-by-step • Passphrase 25th-word details.
Safe storage starts with a correct setup. Go through the checklist above, and consider multisig for larger holdings.