Key derivation# One seed, written as words, for a whole tree of keys that every wallet can find again. Hierarchical deterministic wallets (BIP32, 2012) Hierarchical deterministic wallets (BIP32, 2012) Mnemonic seed phrases (BIP39, 2013) Mnemonic seed phrases (BIP39, 2013) Multi-account derivation paths (BIP44, 2014) Multi-account derivation paths (BIP44, 2014)