Bip39 Mnemonic. You'd then do a essential recovery with a command such as just one beneath. (This command takes advantage of a sample wallet file bunlded with BTCRecover) words, or enter your own beneath. Mnemonics with under twelve words have very low entropy and may be guessed by an attacker. https://socialtechnet.com/story4086892/bip39-passphrase-https-linktr-ee-bip39-a-secret-weapon-for-bip39-mnemonic