Privacy coin bug triggers $100M long liquidations

TLDR

A critical bug in Zcash (ZEC) caused a violent price drop that liquidated roughly $100 million of long positions and added to a broader derivatives wipeout.

1. A counterfeiting vulnerability in Zcashs Orchard privacy pool was disclosed, and ZEC fell around 30 to 50 percent in a day.
2. The crash helped trigger about $100 million in ZEC long liquidations and contributed to roughly $1.2 billion total crypto derivatives liquidations.
3. Developers have patched the bug and are planning supply verification upgrades, but trust and leverage risk around privacy coins remain key things to watch.

Deep Dive

1. What The Bug Was And How ZEC Reacted

Security researcher Taylor Hornby found a critical flaw in Zcashs Orchard shielded pool that could have allowed unlimited, undetectable counterfeit ZEC by bypassing an elliptic curve check, present since 2022 and discovered in late May 2026. Reports note that a full exploit was demonstrated in local tests, but not run on mainnet, and that an emergency hard fork patch went live in early June.

Because Orchard is fully private, developers say it is cryptographically impossible to prove whether the bug was ever exploited before the fix, which is the main source of market anxiety. After public disclosure, ZEC dropped over 30 percent in 24 hours, from above about 600 dollars to near 300 dollars, with some outlets citing intraday moves near 50 percent as the bug news spread and large holders such as Arthur Hayes exited their positions.

2. How This Produced $100M In Long Liquidations

A sharp, fast move in a heavily margined market tends to hit leveraged longs first. One analysis estimates ZEC crashed from above 630 dollars to below 300 dollars in hours, and around 100 million dollars of ZEC long positions were liquidated.

As those positions were force sold, the additional sell pressure pushed prices lower, creating a liquidation cascade where each margin call made the next one more likely. At the same time, the wider market was already stressed, with total crypto liquidations over roughly 24 hours reaching about 1.2 billion dollars, mostly from long positions.

3. What Developers Are Doing And What To Watch

Zcash developers and Shielded Labs state that the bug is now patched and are proposing a further network upgrade that would let anyone verify total ZEC supply and detect any hidden inflation in future, as described in several post disclosure analyses. They also stress that exploiting the bug would have required highly specialized effort, and say they are not strongly convinced it was abused before discovery.

For privacy coin users, the bigger issue is trust: by design, shielded systems make it harder to audit supply, so a single bug can create lingering doubts even after a fix. For traders, the key near term signals will be further audit results, concrete details and timelines on the supply verification upgrade, and whether ZEC funding rates and open interest rebuild or remain depressed.

Conclusion

A deep technical flaw in Zcashs main privacy pool triggered a rapid loss of confidence, a steep price crash, and roughly 100 million dollars in forced long liquidations inside a broader 1.2 billion dollar derivatives washout. Even though the bug is patched, the episode highlights how privacy focused designs can magnify supply uncertainty and how high leverage can turn a protocol scare into a market wide liquidation cascade, making ongoing audits, supply proof mechanisms, and leverage levels essential things to monitor.