Bip39 Mnemonic. You would probably then do a primary recovery which has a command like the one underneath. (This command employs a sample wallet file bunlded with BTCRecover) Any person else who discovers the phrase can steal the bitcoins. It have to be stored top secret, by way of example https://esocialmall.com/story4176199/bip39-wallets-https-linktr-ee-bip39-not-known-details-about-bip39-list