Derivation of keys from path and mnemonic or seed or master key using bips standards.
gogio -o output/wasm -target js .../examples/ui/one
BIP-32 m/purpose'/coin_type'/account'/change/address_index ex m/44'/60'/0'/0/0
StackOverflow - Generate Ethereum Private Key From Mnemonic StackOverflow - Generate Ethereum Private Key From Mnemonic Similar Excellent Tool HD Wallet Article Private Key Vs Hardened Derivation Bitcoin Address From ECDSA Public Key Private Keys Wif
https://github.com/satoshilabs/slips/blob/master/slip-0132.md