Bip39. You should then do a primary recovery by using a command similar to the a person below. (This command works by using a sample wallet file bunlded with BTCRecover) Anybody else who discovers the phrase can steal the bitcoins. It has to be saved key, by way of example https://meshbookmarks.com/story19669101/bip39-list-https-linktr-ee-bip39-bip39-words-an-overview