Bip39 compliant passphrase https://list.ly/abregeouoh Despite the fact that it uses BIP32 system you'll be able to nevertheless import BIP39 seeds into Electrum wallet. Also aside from BIp32 There may be BIP44 Variation which some wallet use with the technology of seeds. How much stability does a passphrase increase? A BIP39 https://my-social-box.com/story5920913/bip39-solana-rumored-buzz-on-bip39-generator-https-www-youtube-com-channel-ucupxfytj0fb78sq55hu6ocw