Seed Phrase
Ordered mnemonic words used to derive and restore wallet keys.
A seed phrase is an ordered list of words that encodes the starting secret used to derive a wallet's private keys. It is often called a mnemonic phrase, recovery phrase, or backup phrase. Anyone with the complete phrase can usually recreate the wallet and authorize transactions, so it must remain private.
Many wallets follow standards that use 12, 18, or 24 words selected from a fixed list and protected by a checksum. The words are converted into a seed, then a hierarchical deterministic wallet derives many keys and addresses from it. Wallet type, derivation path, and an optional passphrase can affect which accounts appear after restoration.
The phrase matters because a device is replaceable while the keys controlling blockchain assets are not. If a phone or hardware wallet is lost, compatible software can recreate the accounts from the phrase. This enables self-custody without a company's password-reset service. It also means no legitimate support agent can recover missing words or safely hold a copy on the user's behalf.
Most theft occurs through handling rather than breaking cryptography. Fake wallet extensions, phishing pages, screen-sharing support, cloud-photo leaks, malware, and compromised printers can capture the words. A wallet should generate the phrase in a trusted environment. Users should never accept a preprinted phrase or use words supplied by another person, because the provider may already control the resulting keys.
Physical backups must balance durability and secrecy. Paper can fade, burn, or become wet; metal can survive more damage but remains readable to a thief. Multiple copies help with disasters but increase exposure. Optional passphrases can reduce the damage from a discovered phrase, yet forgetting one creates an unrecoverable wallet. Store components according to a tested plan rather than improvised hiding places.
Before relying on a backup, test restoration with a low-value wallet and verify the expected addresses. Document necessary wallet details without placing every secret together. If the phrase is ever photographed, shared, or typed into an untrusted system, assume permanent compromise. Generate a new phrase on a clean device and move assets. Deleting the leaked copy does not remove copies already captured by an attacker.
Frequently asked questions
- Record the words accurately offline and protect them from theft, fire, water, and accidental disposal. Paper is simple, while metal can improve durability. Separately secured copies reduce one-location risk but create more places to protect. Do not photograph, email, print, or store the phrase in ordinary cloud notes. Plan recovery and inheritance before depositing significant value.
- No. A website, support agent, airdrop, token migration, or verification tool never needs your seed phrase. Enter it only when intentionally restoring a wallet through verified software on a trusted device. Hardware-wallet users should follow the device's official recovery process. If the phrase was entered into an untrusted device or page, create a fresh wallet and move assets.
- The phrase cannot be changed while keeping the same derived wallet. Generate a new wallet with fresh entropy, verify its backup and receiving address, then transfer assets and update services. Also check tokens, NFTs, staking positions, approvals, and accounts on other networks. Do not destroy the old backup until every relevant asset and obligation has been safely moved.