We held an impromptu Twitter spaces on Proof of Keys day to discuss Bitcoin self custody. I was joined by guests including [Justine Harper]( https://twitter.com/mshodl ), [Jameson Lopp]( https://twitter.com/lopp ), [Dee]( https://twitter.com/HodlDee ), [Craig Raw]( https://twitter.com/craigraw ), [Lazy Ninja]( https://twitter.com/FreedomIsntSafe ) and [Rijndael]( https://twitter.com/rot13maxi ) among others, to discuss all things Bitcoin self custody - from noob to self custody guru!
**Discussion Topics:**
* 00:07:46 Most common ways to lose coins
* 00:19:01 Passphrases
* 00:27:30 Leaving coins on exchanges
* 00:34:51 Metal backups
* 00:40:21 Wallet recovery
* 00:44:01 Singe sig roundup
* 00:44:45 Seed XOR
* 00:48:14 Multisig overview
* 00:51:34 Multisig solutions
* 00:57:28 Unchained capital collaborative multisig
* 01:00:56 Casa collaborative multisig
* 01:04:55 Nunchuk multisig
* 01:09:27 Summary of self custody solutions
* 01:17:12 Security
* 01:18:34 Can SHA256 be broken?
* 01:22:53 Entropy and secure key generation
* 01:29:30 Air gapping and secure software/hardware
* 01:36:59 Binaries
* 01:38:24 Hardware random number generators
* 01:46:00 Quantum computer risk
* 01:46:48 Multisig grifting attacks
* 01:49:13 All signing devices are not made equal
* 01:51:34 Rolling dice for entropy
* 01:52:18 Correctly adding entropy to key generation
* 01:54:15 Important features of hardware wallets
* 01:56:06 "Strength in numbers" in Bitcoin security
* 01:59:06 Different approaches to signing device security
* 02:00:34 True versus concatenated random number generators
* 02:04:00 Summary of complexities and theoretical risks in wallet generation
* 02:05:32 USB VS SD
* 02:11:00 Non secure chip attack vectors
* 02:12:40 Firmware attack vectors
* 02:15:38 Multichip approach to hardware security
* 02:16:18 Relevancy of weighting of dice for creating entropy
**Links & Contacts:**
* Website: https://bitcoin.review/Podcast
* Twitter: https://twitter.com/bitcoinreviewhq
* NVK Twitter: https://twitter.com/nvk
* Telegram: https://t.me/BitcoinReviewPod
* Email: producer@coinkite.com
* Nostr & LN:âš¡nvk@nvk.org (not an email!)
_**Full show notes: https://bitcoin.review/podcast/episode-19/**_