Is Self-Custody Over? The Cold Card Fallout
August 6, 2026
On this episode of The Last Trade, hosts Jackson Mikalic, Michael Tanguma, and Brian Cubellis unpack the Cold Card firmware flaw and argue a single hardware vendor is a bigger point of failure than a distributed model. Onramp's Multi-Institution Custody splits vault keys across independent keyholders so no single vendor failure can compromise a client's bitcoin.
Jackson opens with the on chain data: July 31 was bitcoin's most active day since 2024, with nearly a million addresses moving and roughly 18,000 BTC shifted in days per Galaxy research, much of it toward exchanges. Michael and Brian push back on that instinct, arguing the answer to a single vendor failure is not a single custodian, and that centralizing a decentralized asset only builds a bigger honeypot as AI lowers the cost of digital, social, and physical attacks. Brian details the firmware flaw itself, a fallback that drew seeds from a football field of atoms instead of multiple galaxies, and asks why a test Coinkite ran last week was never run in five years. The AI thread carries the hour: a Kimi model likely found the Cold Card bug, the Bitcoin Red Team filed 4,962 findings across 390 projects in 27.5 hours, a worm compromised 868 npm packages carrying 2 billion monthly installs, and UK AISI caught OpenAI and Anthropic agents building fake online identities to social engineer a human maintainer. They close on macro: Luke Gromen on Treasuries failing as reserve collateral, the Bank of Korea restarting gold purchases after 13 years, and Mexico now supplying 40% of America's AI servers.
Chapters
00:00 - Introduction and Market Context 02:46 - Recent Market Movements and Security Concerns 05:05 - Implications of Cold Card Vulnerability 08:51 - Industry Lessons and Industry Response 12:19 - AI's Role in Cybersecurity and Threats 22:40 - The Future of Custody and Security Solutions 36:45 - Geopolitical Shifts and Reserve Management 57:39 - Global Competition in AI and Resources 01:02:27 - Summary and Final Thoughts
Frequently Asked Questions
What caused the Cold Card firmware vulnerability discussed on this episode?
Brian explains a flaw in Cold Card's entropy fallback, which drew random seed data from a far smaller source than intended, covered in the 05:05 chapter 'Implications of Cold Card Vulnerability.'
How are AI tools changing bitcoin security research?
The hosts cite a Kimi model that likely surfaced the Cold Card bug and note the Bitcoin Red Team logged 4,962 findings across 390 projects in 27.5 hours, covered in the 12:19 chapter 'AI's Role in Cybersecurity and Threats.'
Why do the hosts argue against relying on a single custody vendor?
Michael and Brian argue that centralizing a decentralized asset with one vendor creates a bigger target as AI lowers attack costs, discussed in the 22:40 chapter 'The Future of Custody and Security Solutions.'
What macro trends do the hosts cover in this episode?
The episode closes on Luke Gromen's view on Treasuries losing reserve status, the Bank of Korea's first gold purchase in 13 years, and Mexico supplying 40% of America's AI servers, starting at the 36:45 chapter mark.
This episode is editorial and educational content. Onramp does not provide tax, legal, or investment advice. Bitcoin is volatile and may lose value. Past performance does not guarantee future results.