Bip39 Algorithm As an example, go ahead and take word “accident” for instance. Its very first four letters are “acci”. In case you look at the BIP39 word list, you will note that no other word begins with “acci”. Any one else who discovers the phrase can steal the bitcoins. https://thefairlist.com/story8741170/seed-word-generator-seed-phrase-generator-an-overview