Seed Phrase

The close-up. A seed phrase (also called a recovery phrase or mnemonic) is a human-readable version of the random secret at the root of a self-custody wallet. Most wallets follow a shared standard that draws words from a fixed dictionary, so the sequence looks like ordinary language but is really a compact backup of a very large number. From that single phrase, the wallet can regenerate every private key and address it manages. Order matters: the same words in a different arrangement produce a different wallet.

The wide shot. The seed phrase exists because keys are meant to belong to their owner, not to a company. In self-custody, there is no support line to reset a lost login and no institution holding a copy. That independence is the point of a wallet you control, and the seed phrase is the fallback that survives a broken phone or a failed device. It is also the single most sensitive thing a holder possesses. Whoever reads it can move the assets, and no one can undo a transfer once it is confirmed on the network.

Because of that, a seed phrase is typically written down and stored offline, kept private, and never typed into websites, messages, or apps that request it unprompted. Understanding how recovery phrases work is foundational to using any wallet safely. See related tools for exploring these concepts, and always do your own research.