Ripple CTO Emeritus David Schwartz intervened in the Zcash crisis on June 7, offering measured reassurance to ZEC holders reeling from the disclosure of a critical zero-knowledge proof vulnerability in Orchard’s protected pool.
His position: Passive holders who never move their coins will not lose their funds, provided the bug was never actually exploited. This condition does a tremendous amount of structural work in a sentence that sounds comforting.
The central paradox is this. The Orchard vulnerability, patched via an emergency NU6.2 hard fork on June 2, theoretically allowed the generation of counterfeit ZECs undetected for nearly four years.
Zcash’s own developers cannot prove that the exploit was never triggered, because the privacy architecture that makes ZEC valuable also makes auditing the supply cryptographically impossible. Schwartz’s reassuring words are accurate on their own terms. This cannot be a guarantee.
ZEC fell more than 30% in a single session after the May 29 disclosure, briefly touching its lowest level in more than a month.
The market did not value the confirmed exploitation; it was about assessing an unverifiable risk, which is a different problem and arguably more difficult to solve.
What Schwartz’s statement actually means for holders, and whether it changes anything structurally, is what the rest of this article covers.
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The Orchard Pool Bug: What the Vulnerability Really Means for ZEC
Zcash’s Orchard pool was introduced with Network Upgrade 5 (NU5) in May 2022, the network’s most advanced privacy layer, built on Halo 2-based zk-SNARKs designed to eliminate the trustworthy configuration requirement of legacy Sapling circuits.
The vulnerability resided in an under-constrained element in the elliptic curve multiplication gadget inside the halo2_gadgets box. Simply put, counterfeit entries could bypass validity checks and produce counterfeit ZECs that would still pass verification.
Zcash engineer Taylor Hornby discovered the flaw on May 29, 2026, apparently with the help of formal AI-assisted methods. He confirmed that this was a fully functional exploit in a local testing environment and that running the same exploit on mainnet would have generated true unlimited and undetectable ZEC.
The exposure window extended from Orchard mainnet activation in May 2022 to June 1, 2026, for approximately 4 years. Affected software includes all halo2_gadgets versions prior to v0.5.0, orchard before v0.14.0 and zcashd versions v5.0.0 to v6.12.3.
Shielded Labs and the developers responded quickly, pushing Zebra 4.5.3 as an emergency soft fork to temporarily disable Orchard transactions, then enabling the NU6.2 hard fork via Zebra 5.0 at block 3,364,600 on June 2 at 12:05 UTC+8.
The circuit is now fixed. Here’s the part that matters to holders: the patch addresses the vulnerability going forward, but cannot retroactively prove that supply integrity was maintained for those four years. This window is permanently opaque.
Ripple Schwartz’s Solace: What It Means and What It Can’t Prove
The discussion surfaced after crypto commentator Nate, known on X as @satorinakamoto, questioned whether Zcash could prove the vulnerability was never triggered, given the opacity of the network.
Schwartz, co-creator of XRP Ledger and one of the most technically credible voices in the industry, responded directly: “They will end up feeling a little lonely in the disused pool, but they will still be safe and accessible.”
His broader point: Consensus rules protect each ZEC owner, and protocol designers can set backwards compatibility so that passive holders retain valid, spendable coins, even if the Orchard pool becomes a legacy layer.
The stated assurance is that holders will not lose their assets. This is true under certain conditions; if no exploit has occurred, unmoved funds in older pools remain intact. However, the condition itself is the whole problem.
Shielded Labs explicitly stated in its disclosure: “There is no definitive way to determine, using cryptography alone, whether such exploitation has occurred.” Schwartz’s credentials give his statement real weight. What they can’t lend him is the certainty of a four-year window inside the most opaque layer of a privacy room.
This is not a rejection of Schwartz’s view. His argument that passive holders are safe in the absence of confirmed exploitation is technically consistent. The current framework is that “no confirmed exploitation” is not a condition that anyone can verify, including Zcash’s own developers. Both statements can be simultaneously true. The market assesses the gap between them.
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The post Ripple CTO Says Zcash Holders Are Safe, But Bug That Could Have Created Fake ZEC for 4 Years Cannot Be Disproven appeared first on Cryptonews.
