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A crypto seed phrase is a sequence of words that represents wallet-recovery information. A compatible wallet uses it to derive the keys that control the wallet’s assets, so anyone who gets the phrase may be able to access them. It is a backup for key-generating material—not the cryptocurrency itself and not an ordinary account password.
What a seed phrase does
Wallets use cryptographic keys to control cryptocurrency recorded on a blockchain. A seed phrase gives a person a human-readable way to back up information from which a compatible wallet can recreate those keys. Bitcoin.org describes a recovery phrase as a sequence of words from which a wallet can be restored: Bitcoin.org’s wallet backup FAQ.
The terms seed phrase, recovery phrase and mnemonic phrase are often used for this backup, but wallet implementations and supported standards can differ. A phrase is not guaranteed to work in every wallet app.
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How BIP-39 turns randomness into words
BIP-39 is a deployed specification for encoding computer-generated randomness as a mnemonic phrase and converting that phrase into a binary seed. It is designed for generated randomness, not for turning a sentence chosen by a person into a secure wallet seed. The specification is available in Bitcoin Improvement Proposal 39.
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In BIP-39, the wallet starts with 128 to 256 bits of entropy, adds checksum bits derived from SHA-256, then divides the result into 11-bit groups. Each group selects a word from a specified wordlist. The mnemonic is then processed with PBKDF2 using HMAC-SHA512 and 2,048 iterations to produce a 512-bit seed; an optional passphrase can also be used.
| BIP-39 initial entropy | Mnemonic length |
|---|---|
| 128 bits | 12 words |
| 160 bits | 15 words |
| 192 bits | 18 words |
| 224 bits | 21 words |
| 256 bits | 24 words |
These lengths describe BIP-39, not every wallet’s format. For example, Coinbase Wallet documents a 12-word recovery phrase for its own product; that product-specific detail is not a universal rule. See Coinbase Wallet’s recovery-phrase guidance.
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Why a passphrase and exact wording matter
BIP-39’s optional passphrase is separate from the mnemonic words. Every passphrase produces a valid seed, so entering the wrong passphrase may open a different wallet instead of showing an invalid-password message. If a wallet was set up with a passphrase, recovery requires the right one.
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Protect the phrase as a secret
Anyone who obtains the recovery phrase may be able to access the wallet’s assets. Treat it as highly sensitive: legitimate support agents and websites should not ask you to disclose it. Ethereum.org calls it the wallet’s master key in its wallet security guidance.
- Keep the phrase private; do not enter it into an unsolicited form or share it with someone claiming to recover funds.
- Avoid screenshots and cloud-synced photos. Bitcoin.org advises against photo or cloud storage, and Ethereum.org notes that screenshots may sync to cloud providers.
- Keep an offline backup in a place protected from unauthorized access and physical damage. Choose a storage method based on your own security and recovery needs.
- When restoring a wallet, open its official app or documented recovery flow yourself. Do not paste the phrase into an unfamiliar website.
What a seed phrase cannot guarantee
A seed phrase does not guarantee universal wallet compatibility. Recovery depends on details such as the supported mnemonic standard, wordlist, optional passphrase and wallet implementation. Before relying on a backup, follow the wallet maker’s documentation for that specific wallet and setup.
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A hardware wallet can keep private keys offline, but it does not make the recovery phrase unnecessary. The phrase remains a separate backup and must be protected even if the device is lost or damaged.
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