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Bitcoin Explained - The Technical Side of Bitcoin

Bitcoin, Explained 101: The Coldcard Hack

By Van Wirdum Sjorsnado

Aired Aug 26, 2026 · 1h 5m · Last boosted 3d ago

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Show Notes

Further reading: https://wizardsardine.com/blog/coldcard-rng-vulnerability/ https://engineering.block.xyz/blog/predictable-rng-fallback… Aaron’s Nostr: ⁠npub1art8cs66ffvnqns5zs5qa9fwlctmusj5lj38j94lv0ulw0j54wjqhpm0w5⁠ Sjors’ Nostr: npub1v25jqj332n630klwtqeqxgyrjl4alw4phmluhu2x6lcxzwy9m03suqexw3

Nostr Boost Stats

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CykrosAug 18, 2026
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A million times yes. Thank you for addressing this in the right way. You're one of the only podcasts that hasn't responded to Coinkite with yet more bad options. Very much excited that Learning Bitcoin From The Command Line is getting a new edition too -- long overdue.
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Jul 22, 2026
Nostr Boosts:1k
CykrosJul 22, 2026
1k
Re:other nodes and making news, you're clearly not watching Eric Voskuil on Twitter. Libbitcoin 4 just did IBD in 14 minutes on a consumer connection (with assumevalid height of 950k) and 55 min for full validation. Older than Knots, and older than Core being called, well, Core. They slept for a good few years but are waking up with a vengeance.
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CykrosMay 19, 2025
1k
Thanks for removing the friction from consuming Mises.
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Nostr Boosts:580
CykrosAug 24, 2026
580
Welcome back Walker, congrats on the bigger family Also, xpubs will only give unhardened addresses. That said, I expect a Venn diagram of people who didn't roll dice and people using hardened addresses is probably two separate circles.
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CykrosJul 17, 2026
580
This is sweet, thanks for covering this. Been getting excited listening to @npub1v25jqj332… talk about Stratum v2 for a while now. Nice to see it in action.
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Nostr Boosts:580
CykrosJul 9, 2026
580
Welcome back
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Nostr Boosts:500
CykrosAug 4, 2026
500
The cloak and dagger shit with Switck is heating up. People were already looking for a reason for this to be inside. Still not totally convinced but it looks sketchy as fuck. Never been more glad I had fun playing dice games with my bitcoin.
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Nostr Boosts:500
CykrosJul 23, 2026
500
Boston Bitdevs is coming up on July 30 at MIT Building 4. Be sure to RSVP through bostonbitdevs.org (or with the link if David wants to put it in notes). https://app.evento.so/e/evt_3M48gmwDKdbzNc63 Come with questions!
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CykrosJun 27, 2026
500
One of the best WBD's yet. Dines' coverage of the Eurodollar mechanics here and the shift that happened with LIBOR to SOFR is something far too few people are talking about (Luongo notwithstanding).
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Nostr Boosts:400
CykrosJan 6, 2026
400
Welcome back! Your break sounds like it was good. Missed your updates.
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Nostr Boosts:100
CykrosAug 27, 2026
100
A hung jury isn't an acquittal, it's a mistrial. Jurors aren't voting, they're deliberating to arrive at consensus. If they can't, it's a do over. Double jeopardy only applies if a verdict is reached.
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Aug 19, 2026
Nostr Boosts:100
CykrosAug 20, 2026
100
The Jade and Jade Plus use ESP32 microcontrollers. Just FYI.
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Nostr Boosts:100
CykrosAug 10, 2026
100
Your analogy is odd given that the twentyfirst amendment struck the 18th amendment from the constitution... The issue with 110 is that it was ineffective and targeting an issue that barely qualifies as one. 4 MB is 4 MB.
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Nostr Boosts:100
CykrosAug 7, 2026
100
The point of airgapping isn't that QR'sbor SD cards are inherently more secure than USB or Bluetooth. It's that the amount of data is far more limited and easier to audit with lower tech methods. If you ask me floppy disks would be even better, as SD cards have firmware that could be an attack vector. But floppies are prohibitively hard to implement in 2026.
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Aug 4, 2026
Nostr Boosts:100
CykrosAug 5, 2026
100
'Anything is safer than a coldcard' is not entirely accurate, especially if you're one of the fence cases. Malware hot wallets are having a field day. Saw one user lost 6.07 BTC on mobile 'wasabi' wallet which of course was fake.
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Nostr Boosts:100
CykrosAug 4, 2026
100
Some of the best presentation of the issue I've encountered. Education not recommendations. The multisig evangelists are dangerous, and the guy who hosts the exchange is telling us to self custody. Man of the People @npub1cn4t4cd78… .
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Jul 31, 2026
Nostr Boosts:100
CykrosJul 31, 2026
100
It turns out Leopold was NOT the biggest story of the day @npub1ahe2832lq… .
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Jul 22, 2026
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CykrosJul 23, 2026
100
Guy with half a brain still listening reporting in 😂
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Nostr Boosts:100
CykrosJul 10, 2026
100
I'm thinking the four year cycle is not as there as some have said. Stephen Perrenod has some great writings and math to go with it on some harmonics describing oscillations around the power law trend that seem to make more sense when thinking about fundamental factors. And it follows log time, with the last peak in 2017 and the next in 2027. There are sub harmonics, hence oscillations in between. The fun thing is, it captures the 2011 run up too...
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Nostr Boosts:100
CykrosJul 10, 2026
100
So glad we finally got some weigh in here on the silliness that is 110. And yea, probably was a low blow last time I asked you about this topic on zoom Natalie...
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Nostr Community

Everyone who has boosted Bitcoin, Explained 101: The Coldcard Hack on Nostr, ranked by sats sent, all time.

  1. Kevin Ravens₿erg ⚡️ ☁️ 10k sats
  2. Cykros 500 sats

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