Zcash Plunges 30% to $339 After Orchard Counterfeit Bug Disclosure, Hayes Dumps Entire ZEC Bag

Zcash News

Zcash slid roughly 30% over the past 24 hours after Shielded Labs disclosed a critical vulnerability in the Orchard shielded pool that could have allowed an attacker to mint an unlimited supply of counterfeit ZEC, completely undetected. The flaw, discovered on May 29 by security engineer Taylor Hornby, sat inside the cryptographic circuit that secures Zcash's most advanced privacy transactions on the blockchain. The Zcash Open Development Lab coordinated an emergency patch within days, but markets reacted to the broader implication: the bug had been live since Orchard's activation in May 2022, exposing the protocol's integrity for nearly four years before anyone identified it.

Technical breakdowns of the patched flaw show the vulnerability stemmed from an under-constrained element in the Orchard circuit that permitted arbitrary false inputs into an elliptic curve multiplication check. In practice, the math meant to verify shielded transactions could be tricked into approving forged inputs. Hornby built a working exploit in a local regtest environment that generated unlimited, undetectable counterfeit ZEC. Engineers warned that running the same tool on mainnet would have produced the same outcome inside a real wallet. The emergency hard fork activated on June 3 closed the issue, but the disclosure prompted immediate repricing across spot venues.

An audit framework paired with Anthropic's newly released Opus 4.8 model played a central role in surfacing the flaw, just one day after the model went live on May 28. Hornby ran a custom agent harness against the Orchard circuit and surfaced the soundness defect that years of expert cryptographic review had missed. Shielded Labs is now exploring a network upgrade that would let any participant verify the total ZEC supply, including a new shielded pool and turnstile accounting enforced on all coins exiting Orchard. The proposal is intended to restore auditability for an altcoin whose entire investment thesis rests on cryptographic guarantees.

BitMEX co-founder Arthur Hayes confirmed he liquidated his entire ZEC position in response to the disclosure, writing that he could not hold a privacy asset whose prior exploitation cannot be cryptographically ruled out. Hayes framed the move as part of a broader portfolio rotation, also exiting positions in Hyperliquid and Near Protocol and declaring what he called the "Holy Trinity" of his recent narrative bets dead. The high-profile capitulation amplified selling pressure already cascading through derivatives markets, with forced liquidations contributing to the velocity of the drop on major exchange venues during early Asian hours.

Shielded Labs acknowledged that the privacy properties of Orchard make it cryptographically impossible to determine whether the bug was abused before the patch. The organization stated it is "not overly concerned" that exploitation occurred, arguing the defect was subtle enough to evade years of scrutiny by leading cryptographers, and that discovery required a deliberate, highly skilled audit campaign. Even so, the inability to prove the supply has not been inflated remains the central concern for holders. Market capitalization contracted by more than $3 billion in the immediate aftermath, with the impact rippling into related privacy-coin valuations.

The current crash unwound much of the rally that followed an earlier emergency upgrade, when developers briefly disabled Orchard transactions via soft fork while preparing the NU6.2 hard fork that re-enabled the pool with a corrected circuit. At the time, confusion over stale block explorers fueled rumors that the chain itself had halted, even though miners continued producing blocks. ZEC traded near $620 during that episode as bidders rewarded what looked like decisive crisis management. The subsequent disclosure of the underlying severity reversed that sentiment, with the token now testing levels last seen in early May and the broader privacy-coin narrative facing renewed scrutiny.

ZEC is trading near $339.82 after a 43.9% daily drawdown, with the first defensive band stacked at $343.91 and a deeper structural bear market floor at $298.60. RSI at 34.19 sits just outside oversold territory while MACD prints a confirmed bearish cross, and price action remains sideways within an expanding range. A reclaim of $381.64 would neutralize the immediate breakdown and open a retest of $441; failure to defend $298.60 would expose $248.80 as the next significant bid zone. The bullish thesis requires resolution of supply-auditability concerns; another disclosure or sustained outflows would invalidate any near-term recovery.