What is Seed Phrase?
A seed phrase (or mnemonic) is a sequence of 12 or 24 words that encodes the entropy used to derive all of a wallet's private keys. Anyone with the phrase can fully restore the wallet — store it offline, never share it, and never type it into a website.
Why Seed Phrase matters
Understanding Seed Phrase is part of building a solid mental model of how Bitcoin, blockchain and Web3 systems actually work. Concepts in the Security category sit at the foundation of the broader stack — get them right and the rest is far easier.
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Reading the definition is a start. ZeroToBlock teaches concepts like Seed Phrase through hands-on, browser-based simulations. Build the mental model by actually using it:
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Related terms
- Wallet — Software or hardware that manages your private keys.
- Private Key — The secret number that authorises spending from an address.
More security terms
- 51% Attack — An attack where one party controls majority hash power.
- Cold Storage — Keeping private keys offline for security.
- Custody — Who controls the private keys.
- Slashing — Destroying part of a validator's stake as punishment.
- Multi-Signature (Multisig) — A wallet requiring multiple keys to spend.
- Hardware Wallet — A dedicated device that signs transactions offline.
- Hot Wallet — A wallet whose keys live on an internet-connected device.
- HD Wallet (BIP-32) — A wallet that derives many keys from one seed.
Keep exploring
Continue with the full blockchain glossary — 136 terms in total — or read the developer blog and FAQ for deeper context.