Key takeaways:
- Zcash (ZEC) collapsed today after the disclosure of a critical vulnerability in Orchard’s privacy pool that allowed for the minting of an unlimited number of undetectable fake coins.
- The bug has been in the code since May 2022 and survived subsequent audits. It was only detected by artificial intelligence.
- The worst thing is that for Orchard privacy reasons it is impossible to prove whether someone managed to exploit the vulnerability before the patch.
- I explain why the market is pricing in not the error itself, but four years of uncertainty.
Zcash, or ZEC, one of the most important privacy-focused cryptocurrencies, collapsed today after developers disclosed a critical vulnerability in their Orchard pool. It allowed for the creation of an unlimited number of fake ZECs that the network could not distinguish from real ones. But the most amazing thing is who found it. Not a team of cryptographers who audited this code for four years, but a security researcher supported by an artificial intelligence model.
What exactly happened
The cryptocurrency fell overnight from around $590 to around $256, and then rebounded to around $300. Zcash’s capitalization shrank by over $4 billion. This hurts even more because even before the failure, ZEC was up approximately 600% year-on-year and was one of the few to resist the ongoing market crash. The Orchard pool is the most modern part of Zcash, in which transactions are fully hidden, i.e. neither the parties to the transaction nor its amount are visible. This privacy is a product of Zcash. And it was she who turned a simple mistake into a nightmare.
AI found what humans haven’t seen for four years
The vulnerability was discovered on May 29 by Taylor Hornby, a security engineer hired in April by Shielded Labs to look for holes before criminals find them. For the audit, he used the Opus 4.8 model from Anthropic, the same model that Claude drives. With his help, he wrote a working exploit in a test environment and generated an unlimited number of fake ZECs. The bug has been stuck in the Orchard circuit since the pool launched in May 2022. Since then, subsequent audits by experienced cryptographers have failed to catch this error. Simply put, AI found in a targeted audit what humans had missed for four years.
I believe this is the most important thread of the whole story, more important than the course itself. The same ability that allowed defenders to close the gap is now also available on the other side of the barricade. AI is becoming a standard tool on both security fronts, and whoever lands it first has the advantage. This time the good guys made it. Next time… there are no guarantees.
Why is the market panicking so much?
Developers responded in an emergency. On June 2, they shut down Orchard, and a day later they implemented a revised circuit via a network update. They found no evidence of abuse. The problem is that Orchard is fully encrypted, so it is cryptographically impossible to prove that no one has minted fake coins in these four years. It’s like someone getting the key to a dollar printing machine, except that even the central bank wouldn’t be able to tell which bills were counterfeit. Therefore, the market does not value the error itself, because it has already been patched. It values thirty-six months of uncertainty and potential abuse that, by definition, cannot be resolved.
The reactions were immediate. Arthur Hayes, former head of BitMEX and one of the most vocal supporters of ZEC, sold his entire position, although he admits that real exploitation of the loophole is unlikely. Craig Salm from Grayscale points out that an unnoticed exploit would mean outsmarting the entire team of core developers and then refraining from selling fakes during a huge bull market, which is unlikely. Shielded Labs isn’t overly concerned and is working to improve the network that will allow anyone to independently verify the integrity of the supply.
What does this mean for you
First, be honest about the risks. This is not the first such vulnerability in the history of Zcash, a similar inflation bug was discovered in an older pool in 2018 and was also patched before anyone could exploit it. However, if you hold privacy coins, you need to understand one fundamental trade-off. The privacy you pay for is the exact same feature that, once a bug is detected, makes it impossible to independently verify how many coins actually exist. With Bitcoin, anyone can calculate the entire supply on their own. With an encrypted ZEC pool, you have to trust the math and the developers.
In my opinion, finding and patching a bug before there is evidence of abuse is the success of transparent, AI-powered security. But for an asset whose entire value is trust in the hidden supply, a message like “trust us, everything’s probably fine” is a very hard sell. Until yesterday, ZEC was an island of green in the red market, and today its owners learned a hard lesson that privacy and verification are pulling in opposite directions. The decision is yours, but make it with the awareness of what cannot be verified precisely.
