Seed Phrase
A seed phrase (also called a recovery phrase or mnemonic) is a human-readable sequence of 12 or 24 words that encodes the master secret from which all private keys in a wallet are derived. It is the ultimate backup for your bitcoin.
How It Works
A seed phrase converts a large random number (128 or 256 bits of entropy) into a sequence of words drawn from a standardized list of 2,048 English words defined by BIP39. The 12-word format encodes 128 bits of entropy, while 24 words encode 256 bits. The final word includes a checksum to catch transcription errors. From this seed, a master key is derived, and from that master key, billions of individual private keys can be generated deterministically.
This means your entire wallet — every address, every key, past and future — is encoded in those words. If your hardware wallet is destroyed, lost, or stolen, you can recover everything by entering your seed phrase into a compatible wallet. This is both the greatest convenience and the greatest risk of the system.
Proper generation and storage are both non-negotiable. Use a supported wallet flow that mixes independent device randomness with private input you control; never invent the words yourself. Write the resulting words on paper, then transfer them to a metal backup. Never store the seed or the complete entropy sequence digitally — not in a photo, notes app, cloud storage, or email.
Key Points
- 12 or 24 words encoding the master secret for your entire wallet
- Standardized by BIP39 using a 2,048-word dictionary with built-in checksum
- Enables complete wallet recovery on any compatible device
- Generate it with independent device entropy plus a private contribution you control
- Must be stored offline, physically secure, and never digitized
- Metal backups protect against fire, flood, and physical degradation