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Seed Phrase

In simple terms

A seed phrase is a list of random words that acts like a master password for your crypto wallet. If you lose access to your wallet, you can use these words to recover all your funds—it's like having a backup key to your digital safe.

Definition

A recovery phrase used to restore a wallet.

In depth

A seed phrase is a mnemonic sequence (typically 12 or 24 words) derived from a random entropy source that serves as the root key for deterministic wallet generation following the BIP32/BIP39 standards. This seed undergoes PBKDF2 key derivation to produce the master private key, from which hierarchical child keys are generated through elliptic curve mathematics, allowing full restoration of all derived addresses and funds without relying on centralized backups or service providers.

How does Seed Phrase work?

When a wallet is created it generates random entropy — typically 128 or 256 bits — and maps it onto 12 or 24 words drawn from a standard list of 2,048, with the final word acting as a checksum. Those words are stretched into a master seed, and every private key the wallet will ever use is derived from that seed along a defined path. Because the standard is shared across wallets, entering the same phrase into any compatible one regenerates exactly the same keys and addresses. The words are not a password on an account; they are the account.

An example

Illustrative case: someone writes down 12 words at setup and stores them in a safe. Two years later the hardware wallet is destroyed during a house move. They buy a replacement, enter the same 12 words, and the same addresses and balances reappear — the keys were rebuilt from the phrase, not restored from the device. Anyone else who reads those words gains identical access.

Figures are illustrative only.

What beginners get wrong

  • Typing the phrase into a phone or laptop for safekeeping puts the one irreplaceable secret onto an internet-connected device.
  • Anyone claiming to be wallet support who asks for the words is running a scam; no legitimate wallet ever needs them.
  • Word order matters as much as the words themselves, so a phrase written down out of sequence will not restore anything.
  • Keeping a single copy in a single place means a fire, a flood, or a misplaced notebook ends access permanently.

Related terms

Part of

How do crypto wallets and self-custody work? — the subject page for wallets and self-custody, with all 13 of its definitions in one place.

Educational only — not financial advice.