This is an emergency episode to warn everyone of the catastrophic Coldcard entropy bug that’s letting attackers regenerate users’ keys and drain wallets without device access.

I walk through concrete, step‑by‑step instructions to move your coins to safety (including using Sparrow, Nunchuck, and even exchanges as a last resort), who’s most at risk across MK3, MK4, MK5, and Q devices, and what this means for hardware wallets, AI‑driven security research, and multi‑sig going forward.

This is the worst hit to self custody in Bitcoin's history. All we can do is act as quickly as possible. If you have a coldcard in your setup, you need to move to safe keys or cycle your multisig, don't wait, don't assume you have time, sit down and get it done. Do it carefully and don't skip steps.

Here are a few of the quickest paths to safety and how to think about this going forward. To everyone who got hit by this, I cannot be more sorry.

Chapters

(00:00:00) - Coldcard bug red alert

(00:02:07) - MK3 absolute worst case

(00:03:16) - Other wallets who’s safe

(00:04:33) - Links confirmation panic check

(00:05:18) - Dice entropy and urgency

(00:05:56) - MK4 MK5 Q risk

(00:06:57) - Fastest escape route

(00:08:59) - Recovering with just seed

(00:09:43) - When to use exchange

(00:11:03) - Multisig exposure lessons

(00:16:35) - Personal note

Affiliate Links

Become sovereign, hold your keys, be censorship resistant with the Bitbox hardware wallet. Get 5% off everything in the store with code GUY (Link: https://bitbox.swiss/guy/)
Get 10% off the best Bitcoin board game in the world, HODLUP! Or any of the other great games from The Free Market Kids! Use code GUY10 at checkout for 10% off your cart! (Link: https://www.freemarketkids.com/collections/games-1)

References from the episode\

Coinkite Security Advisory: https://blog.coinkite.com/coldcard-mk3-seed-generation-warning/\
Predictable RNG Fallback and 32-Bit Reseed in COLDCARD Firmware (Block): https://engineering.block.xyz/blog/predictable-rng-fallback-and-32-bit-reseed-in-coldcard-firmware Host Links ⁠Guy on Nostr ⁠(Link: http://tinyurl.com/2xc96ney) ⁠Guy on X ⁠(Link: https://twitter.com/theguyswann) Guy on Instagram (Link: https://www.instagram.com/theguyswann) Guy on TikTok (Link: https://www.tiktok.com/@theguyswann) Guy's Takes on YouTube (Link: https://www.youtube.com/@GuysTake) Guy Swann on YouTube (Link: https://www.youtube.com/@theguyswann) ⁠Bitcoin Audible on X⁠ (Link: https://twitter.com/BitcoinAudible) The Guy Swann Network Broadcast Room on Keet (Link: https://tinyurl.com/3na6v839)