Stolen funds from the massive Coldcard hardware wallet exploit are now being laundered through privacy protocols, but most of the $100M+ haul remains parked in hacker wallets.
🚨 The Latest: 64 BTC and 200 ETH Sent to Mixers
Blockchain security firm CertiK has detected that approximately 64 Bitcoin (worth $4.17 million)** and **200 Ether (worth $380,000) linked to the Coldcard attack were transferred to cryptocurrency mixing protocols this week .
The Bitcoin was sent to Wasabi Wallet, while the Ethereum was routed through Tornado Cash after being bridged via THORChain . CertiK believes this may be the work of a "smaller exploiter" or copycats, noting that "there's likely a few copycats after the initial exploit" .
"Mixing protocols like Tornado Cash pool and scramble cryptocurrency from multiple users, breaking the publicly traceable on-chain link between senders and recipients." — CertiK spokesperson
📊 The Scale of the Coldcard Exploit
The Coldcard hack has become the third-largest cryptocurrency heist of 2026 . Here's the breakdown:
| Metric | Value |
|---|---|
| Confirmed Losses | 1,596 BTC (~$100M+) |
| Affected Wallets | ~7,300 addresses |
| Attack Waves | 3 confirmed + 1 suspected |
| Potential Total | ~2,055 BTC (~$130M) |
| Number of Attackers | At least 15 separate actors |
Galaxy Digital's research shows that one sweep moved $70 million in just 41 minutes . The victims are predominantly retail holders, not institutions, with most losing less than 1 BTC .
🔍 The Technical Weakness: A Tiny Coding Error
The root cause traces back to a March 2021 firmware bug that weakened seed randomness .
What happened:
A build guard used
#ifndefinstead of#if, checking whether a setting exists rather than whether it's switched onCoinkite had defined that setting as "0" (meaning "off"), but because zero still counts as "defined," the safety check passed
The firmware silently rerouted seed generation from Coldcard's hardware random number generator to a software fallback called "Yasmarang"
The result: Effective entropy dropped from 128 bits to just 40 bits—making private keys "brute-forceable without physical access" . For a known device ID, wallet generation became nearly deterministic .
Coinkite suspects the vulnerability was discovered using AI, writing: "We have to assume that someone used AI to review previous versions of our firmware and stumbled upon this issue" .
🧩 What Are Mixers and Why Do They Matter?
Cryptocurrency mixers like Tornado Cash and Wasabi Wallet enhance transaction privacy by pooling funds from multiple users and redistributing them—breaking the on-chain link between sender and recipient .
Why this matters now:
The first signs of laundering have emerged, but TRM Labs reports that most victim funds remain concentrated in a small number of attacker-controlled addresses with limited mixing activity
If additional batches of stolen funds begin moving to mixers, recovery becomes nearly impossible
Differences in transaction construction between attack waves suggest multiple actors with distinct operational playbooks
⚠️ What Coldcard Users Must Do Now
Coldcard CEO Rodolfo Novak apologized publicly, saying: "I'm sorry and I'm devastated. Our team is heartbroken" .
Immediate actions for affected users:
Update firmware immediately
Generate a new seed phrase (existing seeds remain compromised)
Do not dispose of the affected device—it may be needed for recovery efforts
"A firmware update on its own changes nothing for the coins you hold today. If any of your key was generated on a Coldcard... you may be at risk." — WizardSardine
📌 Key Takeaways
⚠️ Disclaimer
This content is for informational purposes only. Not financial advice. Cryptocurrency markets and security incidents are highly volatile. Always do your own research (DYOR) before making any investment decisions.
Sources: CertiK, Galaxy Digital, TRM Labs, Cointelegraph, KuCoin News, Yahoo Finance, CBC News
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