Bip39 First 4 Letters Default number of iterations Utilized in wallets is 2048. Expanding this quantity must help it become safer towards brute power assaults, having said that you will have to retailer this price. To obtain your wallet with custom PBKDF2 you ought to use this script (or identical) https://dmozbookmark.com/story18568477/bip39-ian-coleman-5-easy-facts-about-seed-phrase-generator-described