Bip39 List. You'd probably then do a basic Restoration by using a command such as the one underneath. (This command takes advantage of a sample wallet file bunlded with BTCRecover) Any one else who discovers the phrase can steal the bitcoins. It has to be kept top secret, for example https://atozbookmarkc.com/story18888329/bip39-passphrase-https-linktr-ee-bip39-how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-wallets