Bip39 Vs Slip39. Consequently, to back again up the received bitcoin, you would have to transcribe all the personal keys created every now and then. In actual fact, this Resolution is very unpleasant. For words that only have 3 letters, there is no 4th letter. By way of example with https://directoryglobals.com/listings13032384/bip39-tool-https-linktr-ee-bip39-top-bip39-seed-phrase-secrets