Bip39 Checksum. You would probably then do a standard recovery using a command much like the one down below. (This command takes advantage of a sample wallet file bunlded with BTCRecover) words, or enter your personal underneath. Mnemonics with under 12 words have very low entropy and could be guessed https://bookmarkick.com/story18716775/bip39-generator-https-linktr-ee-bip39-5-essential-elements-for-bip-39