Bip39. You should then do a standard recovery which has a command much like the one below. (This command works by using a sample wallet file bunlded with BTCRecover) Any individual else who discovers the phrase can steal the bitcoins. It need to be held key, one example is it https://modernbookmarks.com/story18851691/ian-coleman-bip39-https-linktr-ee-bip39-what-does-ian-coleman-bip39-mean