5 Bitcoin Mistakes
That Will Cost You Everything

About Lucien Bourdon

Lucien Bourdon is a Bitcoin analyst who came into the space in 2020 after first encountering Bitcoin in 2013. His work covers the macro picture, the broader crypto ecosystem, stablecoins, and institutional adoption trends, which he translates into content and outreach for one of the oldest hardware-wallet companies in Bitcoin.

At Trezor he wears two hats: analyst and Trezor Expert, the support role that walks real users through setting up their first hardware wallet. That hybrid angle is rare. Most Bitcoin commentators only read charts, while Lucien sits in the inbox with people who have just lost access to their backup or clicked a phishing link, so his take on self-custody is grounded in cases, not theory.

This conversation is worth watching for anyone who already owns a hardware wallet or is about to buy one, because Lucien is direct about which threats actually hit users at scale versus the scary-sounding attacks that almost never happen in real life. He explains why the seed phrase, not the device, is the single point of failure, walks through Trezor's SLIP-39 multi-share backup approach as an alternative to DIY cleverness, and gives concrete habits (periodic access tests, never typing the words into a screen) that would have prevented most of the losses he sees.

What was said

1. 30:23 Frames the core self-custody trade-off: holding on Coinbase means someone else controls your private key, while self-custody gives you full sovereignty but zero help line if you mess up.
2. 37:02 Clarifies the biggest beginner misconception: the Bitcoin isn't 'in' the hardware wallet, the wallet just holds the private key offline so malware on your phone or laptop can't reach it.
3. 42:14 Names the seed phrase as the true single point of failure in any self-custody setup: if someone finds it they drain you, if you lose it nobody can recover it for you.
4. 50:34 Mistake #1 - treating self-custody as set-and-forget; he recommends doing an access and backup restore test every 3-6 months so you catch problems while you still remember the setup.
5. 57:26 Mistake #2 - storing the seed phrase somewhere too 'clever' (etched on door hinges, hidden in a book, buried in the garden) and then forgetting the location months or years later.
6. 58:19 Mistake #3 - falling for phishing emails that mimic Trezor and ask you to 'update your wallet' by typing the 24 words into a website; the words should never touch a keyboard or screen, ever.
7. 59:42 Mistake #4 - DIY-ing the backup by splitting it in half, scrambling word order, or adding an undocumented passphrase you can't remember later; SLIP-39 multi-share backups solve the same problem without custom tricks.
8. 57:52 Mistake #5 - never verifying that the backup was written down correctly; he points to Trezor's on-device 'check backup' feature that confirms the words actually match the wallet before you need them in an emergency.