Bip39 or slip39 https://blogfreely.net/travenmdoq/create-your-own-distinct-bip39-mnemonic-expression-with-python-scripts Although it works by using BIP32 system it is possible to still import BIP39 seeds into Electrum wallet. Also besides BIp32 There exists BIP44 Variation which some wallet use for that era of seeds. BIP39 simplifies vital management by changing extensive cryptographi... https://social-lyft.com/story10815175/bip39-golang-5-essential-elements-for-bip39-word-list-pdf-https-www-youtube-com-channel-ucupxfytj0fb78sq55hu6ocw