Bip39 Checksum. You would probably then do a primary recovery by using a command just like the just one down below. (This command works by using a sample wallet file bunlded with BTCRecover) No, there isn't any specialized limit to the size of the passphrase. Even so, for that sake https://keybookmarks.com/story19174424/bip-39-https-linktr-ee-bip39-what-does-ian-coleman-bip39-mean