What is a Seed Phrase?
A list of 12 or 24 words that represents your wallet's private keys in a human-readable format. The ultimate backup for your bitcoin.
Why It Matters
A seed phrase is the most important piece of information you own if you use Bitcoin self-custody. These 12 or 24 words encode all the information needed to regenerate your private keys, so if you lose your device, you can restore your wallet on a new device using the seed phrase. Conversely, anyone with your seed phrase can generate all your private keys and steal your bitcoin. Seed phrases must be stored securely—written down on paper, stored in a safe, never digitized or photographed. The BIP-39 standard ensures that seed phrases are compatible across different wallets, so even if your wallet software becomes unavailable, another wallet can import your seed phrase and recover your bitcoin.
How It Works
When you create a Bitcoin wallet, the software generates a seed phrase using a random source and the BIP-39 standard. Each word is selected from a list of 2048 approved words. The phrase encodes a master seed (a long random number) from which all your wallet's private keys are derived. You write down the seed phrase in order. If you need to recover your wallet, you enter these words into any compatible wallet software (in the correct order), and it regenerates your private keys and addresses. The mathematical relationship between seed phrase and keys is deterministic—the same seed phrase always generates the same keys.