Zcash founder Zooko Wilcox announced that Anthropic’s advanced Mythos AI model has found no further ‘serious bugs’ in the privacy-focused cryptocurrency’s protocol, following the patching of a critical forgery vulnerability earlier this month. The announcement, made via a post on X on Saturday, marks a significant step in restoring confidence in Zcash’s security infrastructure.
AI-driven audit clears Zcash protocol after emergency patch
Shielded Labs, a Swiss non-profit organization dedicated to supporting Zcash development, commissioned the AI-powered security audit. According to Wilcox, the Mythos model conducted a thorough examination of the Zcash protocol and did not identify any additional high-severity vulnerabilities beyond the one already addressed.
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On June 3, Zcash developers temporarily suspended Orchard transactions after discovering a forgery bug in the shielded pool. The vulnerability, which had existed for four years, was identified by security researcher Taylor Hornby using Anthropic’s Claude Opus 4.8 model. Functionality was restored later that same day through an emergency upgrade. The Zcash Foundation confirmed that there was no evidence the bug was exploited, no unauthorized value was created, and user privacy remained unaffected.
AI models reshape crypto security environment
The use of advanced AI models for vulnerability discovery is rapidly changing the cybersecurity dynamics in the cryptocurrency industry. Anthropic released the first public version of its Claude Mythos model, named Fable 5, on Tuesday. The company previously stated that the Mythos model had uncovered more than 10,000 high or critical-severity vulnerabilities in ‘systemically important software,’ raising questions about the implications of releasing such powerful tools publicly.
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Anthropic assured users that Fable 5 was ‘made safe for general use’ and includes safeguards that redirect certain sensitive tasks, such as cybersecurity analysis, to a different model, Claude Opus 4.8. However, on Friday, Anthropic suspended access to both Fable 5 and Mythos 5 following a US government export control directive citing national security concerns.
Industry experts warn of ‘vulnerability apocalypse’
The proliferation of powerful AI models is shifting the cybersecurity playing field in favor of threat actors, according to Mitchell Amador, CEO of bug bounty platform Immunefi. In a recent interview, Amador described the trend as a ‘vulnerability apocalypse’ that is fueling a resurgence in decentralized finance (DeFi) hacks. Data from DefiLlama shows that crypto hacks surged to $634 million in April 2026, the highest monthly value since the Bybit hack resulted in approximately $1.4 billion in losses in February 2025.
For Zcash, the clean bill of health from the Mythos AI audit is a positive signal for users and developers who rely on the protocol’s privacy guarantees. The incident underscores the growing role of artificial intelligence in both defending and attacking blockchain networks, a dual-use reality that the industry is still learning to address.
Conclusion
The completion of a comprehensive AI security audit without further serious findings represents a milestone for Zcash’s security posture. As AI tools become more integrated into blockchain security workflows, the balance between innovation and risk will remain a central theme for the cryptocurrency ecosystem.
FAQs
Q1: What did Anthropic’s Mythos AI find in the Zcash audit?
The Mythos AI model found no additional serious bugs in the Zcash protocol after a critical forgery vulnerability was patched. The audit was commissioned by Shielded Labs.
Q2: Was the Zcash Orchard vulnerability exploited?
No. The Zcash Foundation stated there was no evidence of exploitation, no unauthorized value creation, and user privacy remained unaffected.
Q3: Why did Anthropic suspend access to Fable 5 and Mythos 5?
Anthropic suspended access to these AI models following a US government export control directive citing national security concerns.
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