For those who adopted the methods higher than now you should be able to make and verify the correctness of BIP-39 seeds oneself (with nominal guidance from tools like binary to hex to decimal converters). This extra complexity boosts the threat of misplacing the passphrase, and thus shedding your copyright. https://bookmark-nation.com/story18693753/ledger-seed-phrase-bip39-no-further-a-mystery