Zooko Says ZEC Holders Dodged Bullet After Sprout Bugs Surface

Zcash founder Zooko Wilcox says ZEC holders “dodged a bullet” after two bugs were found in the old Sprout shielded pool, including one issue that could have allowed counterfeit coins inside the legacy privacy pool.

The comment follows disclosures detailed by Zcash developers and researchers, including findings shared via the Electric Coin Company blog, which outlined historical vulnerabilities in Sprout and their potential implications for hidden supply integrity.

The market had already been focused on the Orchard vulnerability disclosed earlier this month, when Zcash patched a flaw that could have allowed invalid accounting inside its newest shielded pool. The older Sprout pool now brings attention back to Zcash’s earliest privacy system and the limits of shielding designs that depend on complex zero-knowledge proof circuits.

Sprout was Zcash’s original shielded pool before Sapling and Orchard became the network’s newer privacy layers. It is now a legacy part of the protocol, and ordinary user activity has largely moved away from it. The risk still matters because old shielded pools can carry remaining balances, old assumptions, and technical debt that may not be visible to newer users watching only current wallet and exchange flows.

One of the Sprout bugs was especially sensitive because it involved the possibility of counterfeit value inside the pool. In Zcash, that kind of flaw can become more difficult to evaluate than a normal transparent-chain exploit because shielded transactions hide amounts and participants by design.

Turnstile Accounting Limited Wider Exposure

The key safeguard is Zcash’s turnstile accounting system. Sprout, Sapling and Orchard do not operate as unlimited isolated money printers that can freely leak hidden counterfeit supply into the rest of the chain. Value entering and leaving shielded pools is constrained through pool-level accounting, limiting how much can exit compared with how much legitimately entered.

That is why Zooko’s “dodged a bullet” comment does not mean the entire ZEC supply was necessarily compromised. A Sprout counterfeiting bug could have created fake value inside Sprout, but withdrawals out of the pool would still be constrained by the turnstile. The larger practical risk would sit around users or services still accepting Sprout activity, remaining balances in the old pool, and confidence in the audit surface around legacy shielded systems.

The timing is uncomfortable for Zcash. ZEC holders are still digesting the earlier AI-assisted Orchard flaw, which triggered a sharp market selloff and forced the ecosystem to explain why a highly reviewed privacy circuit had carried a critical bug for years.

Zcash contributors later said Orchard exploitation was unlikely and outlined the Ironwood upgrade path to restore stronger supply checks through a new shielded pool and turnstile-style accounting. That plan remains central to the current recovery story after Zcash framed Ironwood around supply verification.

ZEC Holds Recovery As Security Debate Continues

ZEC recently traded near $446, up slightly on the day but still far below the levels seen before the Orchard disclosure. The token has recovered from the worst post-disclosure lows, but confidence remains tied to whether Zcash can prove supply integrity more convincingly after multiple shielded-pool scares.

The security response has already expanded beyond one bug. The Orchard incident pushed researcher Taylor Hornby and AI-assisted auditing into the spotlight, and the same researcher later added Monero to the audit queue as privacy-coin communities watched whether advanced models could find deeper cryptographic implementation flaws.

The Sprout comments now sharpen the legacy-risk angle. Zcash’s strongest feature is privacy, but that same privacy increases the cost of proving that hidden state remained clean after a serious soundness issue. Turnstile accounting contained the danger outside Sprout, while Orchard’s Ironwood path is aimed at restoring stronger verification for the modern shielded pool.

Zcash now has two live security narratives moving together: patched legacy Sprout bugs that Zooko says ZEC holders survived, and the newer Orchard recovery path meant to rebuild confidence in shielded supply integrity. The next test is whether Ironwood, continued audits and legacy-pool cleanup can keep the privacy model intact without leaving holders dependent on trust in past assumptions.

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