Bip39 implementation https://atavi.com/share/xbwf7vz16jgof Let us believe It will likely be 10x quicker compared to GFX card over so approximately 2,4M hashes/s. An average attacker will personal a couple of this kind of specialised devices. For words that have only 3 letters, there's no 4th letter. For instance Using the word https://pukkabookmarks.com/story20595458/bip39-app-bip39-checksum-an-overview-https-cutt-ly-uryc5rw7