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3 entries
Defined the standard for generating human-readable mnemonic seed phrases (typically 12 or 24 words) from random entropy. Combined with BIP 32, became the universal Bitcoin wallet backup method.
Introduced hierarchical deterministic (HD) wallets — an entire tree of key pairs derived from a single master seed. Eliminated frequent-backup needs and enabled organized parent-child key derivation.
Satoshi reveals the wallet location (%appdata%\Bitcoin), explains it uses a transactional database (DBM) safe from crash/power loss, and confirms socket cleanup code is added for the next release.