// GLOSSARY -- BLOCKCHAIN & CRYPTO FUNDAMENTALS

What is Seed Phrase?

1 min read Updated

A seed phrase (recovery phrase) is a human-readable sequence of 12 or 24 words that encodes the master private key for a cryptocurrency wallet — serving as the ultimate backup and recovery mechanism.

WHY IT MATTERS

Seed phrases are the master key to your crypto. From this sequence of common English words, all private keys in an HD (hierarchical deterministic) wallet can be regenerated. Lose your device? Import the seed phrase into a new wallet and everything is restored.

The BIP-39 standard defines how seed phrases work: 2048 possible words, where the specific sequence maps to a master seed through PBKDF2 hashing. From this seed, unlimited addresses are derived using BIP-32/BIP-44 derivation paths.

Security is paramount: anyone with your seed phrase controls all associated wallets. It should be written on paper or metal, stored offline, and never entered on a computer except when restoring a wallet. Phishing attacks targeting seed phrases are the most common attack vector.

FREQUENTLY ASKED QUESTIONS

Where should I store my seed phrase?
On paper or metal, in a physically secure location. Never digitally — no photos, no cloud storage, no text files. Consider splitting across locations for high-value wallets.
What if someone finds my seed phrase?
They can steal everything instantly. Treat it like the combination to a safe containing all your crypto. Consider a passphrase (25th word) for additional protection.
Are all seed phrases 12 words?
Most wallets use 12 or 24 words. 24 words provide more entropy (256 bits vs 128) but 12 is considered secure. Some wallets support custom word counts.

FURTHER READING

Enforce policies on every tool call

Intercept is the open-source MCP proxy that enforces YAML policies on AI agent tool calls. No code changes needed.

npx -y @policylayer/intercept
github.com/policylayer/intercept →
// GET IN TOUCH

Have a question or want to learn more? Send us a message.

Message sent.

We'll get back to you soon.