Zcash bug recovery underscores due diligence risks in privacy crypto market

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Zcash bug recovery risks

Highlights

Zcash's Orchard shielded pool contained a bug from May 31, 2022 that could allow creation of counterfeit ZEC without public trace, exposing due diligence risks in privacy tokens.
ZEC price plunged about 38% from $635 to $309 after the flaw was revealed, with over $100 million in leveraged positions liquidated amid concerns about untraceable coin creation.
On July 28, Zcash sealed the old pool with a turnstile, launched Ironwood, and ZEC rebounded 323% to $1,438 as market repriced recovery efforts despite confidence breach.

Security flaw and emergency response

As reported by Weiss Ratings, the vulnerability stemmed from two lines of code in Orchard, Zcash's shielded pool, that could have allowed counterfeit ZEC to be created without leaving a public trace. The issue affects the mathematical checks used to verify hidden transactions, raising concern because privacy features make direct public inspection impossible.

White hat hacker Taylor Hornby, hired by Shielded Labs in April to search for vulnerabilities, traced the flaw to May 31, 2022 and produced a working exploit the same day he found it. He reported it that evening; by June 1 the team shut Orchard down, and corrected code went live two days later.

Zcash is able to push through the emergency update quickly because far fewer operators need to adopt new code than on Bitcoin, where miners and node operators must broadly coordinate. Even so, the incident breaks confidence in one key guarantee, because the network can no longer mathematically prove that no excess coins were created inside the old pool during that period.

Market fallout and investor implications

ZEC falls about 38% in a day after the flaw comes to light, dropping from roughly $635 to $309, while more than $100 million in leveraged positions is liquidated. The selloff reflects uncertainty over whether additional ZEC may have been created during the more than four years the bug remained in the code.

On July 28, the team seals the old Orchard pool behind a turnstile mechanism and opens a new shielded pool called Ironwood. The old pool holds about 3.66 million ZEC, while the new pool starts empty, and the turnstile is designed to prevent more ZEC from exiting the old system than legitimately entered, effectively trapping any counterfeit coins if they exist.

Shielded Labs says exploitation is unlikely but cannot be ruled out, and a later review using a newer Anthropic model finds no additional critical bugs. From the June 6 low near $340, ZEC is up about 323% to roughly $1,438 at the time of writing, suggesting the market is repricing the project around its recovery measures as much as the original failure.

For investors, the episode highlights the need to check when a project's last security review took place and whether active resources are still being devoted to finding flaws. It also shows that market damage after bad news does not rest only on the bug itself, but on how quickly a team contains the risk and rebuilds trust.

Our earlier article on federal backing for H2 Analytics’ AI-driven EASE platform detailed how FedDev Ontario provided C$800,000 to support upgrades to simulation tools used for defence and security training. We noted the funding focus on improving the platform’s ability to run more complex exercises, add multilingual support, and help the company expand internationally, reflecting broader government support for security-focused tech innovation in Ottawa.

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