Bip39 Seed. You would then do a simple recovery by using a command much like the just one under. (This command makes use of a sample wallet file bunlded with BTCRecover) Any one else who discovers the phrase can steal the bitcoins. It need to be saved top secret, by https://lingeriebookmark.com/story8854993/bip39-wallet-https-linktr-ee-bip39-top-guidelines-of-bip39-mnemonic