Ledger Nano Bip39 Generating entropy can be carried out manually or with a computer. Both solutions have pros and cons, but when generating entropy, care need to be taken in order that the method is done effectively and is particularly free of charge from outside the house manipulation or observation. https://icelisting.com/story20030321/bip39-passphrase-inheritance-the-fact-about-bip39-phrase-that-no-one-is-suggesting