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What Standard Defines the Creation of a Seed Phrase?

The creation of a seed phrase is primarily defined by the Bitcoin Improvement Proposal 39 (BIP39). This standard outlines the process of generating a mnemonic phrase, which is a list of easy-to-remember words used to create a master seed.

The master seed then deterministically generates all the private keys for the wallet.

Can a Seed Phrase Be Used to Restore Multiple Private Keys?
What Is the Purpose of a Hardware Wallet’s Recovery Seed Phrase?
What Is the Relationship between a Private Key and a Seed Phrase?
How Is a Private Key Typically Represented (E.g. Format)?