Bitcoin Q&A: Passphrases and seed storage

Do passphrases protect against leaks or compromises of mnemonic seed words? Why are brain wallets usually insecure? Why should you not "roll your own crypto" and promote creative schemes that deviate from the standards (like BIP39), without at least getting peer review and testing from other developers, cryptographers, or security researchers?

See the documentation and support pages of various hardware wallets for more information:

Trezor - https://doc.satoshilabs.com/trezor-faq/overview.html https://blog.trezor.io/using-advanced-recovery-on-trezor-4af0eb53c3bb
Ledger Nano S - https://support.ledgerwallet.com/hc/en-us/articles/360000613793-Initialize-your-device
Ledger Blue - https://support.ledgerwallet.com/hc/en-us/articles/360005835414-Initialize-your-device
KeepKey - https://help.keepkey.com/start-here/initialize-your-keepkey https://help.keepkey.com/how-to-guides/how-to-recover-your-keepkey

On the topic of inheritance and estate planning, see: https://youtu.be/4g8rO_queMw

These questions are from the August monthly Patreon Q&A session, which took place (late) on September 1st 2018. If you want early-access to talks and a chance to participate in the monthly live Q&As with Andreas, become a patron: https://www.patreon.com/aantonop

RELATED:
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Andreas M. Antonopoulos is a technologist and serial entrepreneur who has become one of the most well-known and respected figures in bitcoin.

Follow on Twitter: @aantonop https://twitter.com/aantonop
Website: https://antonopoulos.com/

He is the author of two books: “Mastering Bitcoin,” published by O’Reilly Media and considered the best technical guide to bitcoin; “The Internet of Money,” a book about why bitcoin matters.

THE INTERNET OF MONEY, v1: https://www.amazon.co.uk/Internet-Money-collection-Andreas-Antonopoulos/dp/1537000454/ref=asap_bc?ie=UTF8

[NEW] THE INTERNET OF MONEY, v2: https://www.amazon.com/Internet-Money-Andreas-M-Antonopoulos/dp/194791006X/ref=asap_bc?ie=UTF8

MASTERING BITCOIN: https://www.amazon.co.uk/Mastering-Bitcoin-Unlocking-Digital-Cryptocurrencies/dp/1449374042

[NEW] MASTERING BITCOIN, 2nd Edition: https://www.amazon.com/Mastering-Bitcoin-Programming-Open-Blockchain/dp/1491954388

Translations of MASTERING BITCOIN: https://bitcoinbook.info/translations-of-mastering-bitcoin/

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