Bip39 English Words As an illustration, take the word “incident” as an example. Its very first four letters are “acci”. In case you think about the BIP39 word list, you will note that no other word commences with “acci”. Any person else who discovers the phrase can steal the bitcoins. https://icelisting.com/story19579052/bip39-compliant-passphrase-indicators-on-bip39-phrase-you-should-know