key-derivation

BIP 32 — Hierarchical Deterministic Wallets

Introduced hierarchical deterministic (HD) wallets, allowing an entire tree of key pairs to be derived from a single master seed. This eliminated the need for frequent backups and enabled organized key management with parent-child key derivation.

BIP 39 — Mnemonic Code for Generating Deterministic Keys

Defined the standard for generating human-readable mnemonic seed phrases (typically 12 or 24 words) from random entropy. Combined with BIP 32, this became the universal backup method for Bitcoin wallets, allowing users to recover funds by writing down a word list.