For that reason, you may execute all of these functions offline and use additional variable parameters chosen manually by the user. After the seed is produced, one of the better storage answers is offline storage, Most likely on various sheets of paper or metallic seed keepers. To try to understand http://andersonsaeu988.iamarrows.com/from-mnemonics-to-safety-and-security-recognizing-bip39-passphrases-and-their-significance-in-copyright