Zcash activated its Ironwood network upgrade on July 28, permanently sealing the Orchard shielded pool and replacing it with a new pool under NU6.2 rules. The move comes two months after a critical counterfeiting vulnerability was discovered in Orchard — a flaw that could have allowed an attacker to mint unlimited ZEC inside the private pool. While developers say exploitation was improbable and no evidence of supply manipulation has surfaced, the market has yet to fully trust the fix.
The flaw and its fallout
Taylor Hornby found the bug on May 29. It allowed a crafted proof to create counterfeit ZEC within Orchard's shielded environment. Shielded Labs later reproduced the exploit in a local test. Because Orchard's privacy design prevents cryptographic reconstruction of past transactions, there's no way to know if anyone abused the hole before it was patched. The Zcash community reported no evidence of altered supply or user losses, but the disclosure still hit prices hard. ZEC dropped from roughly $624 to $309 in the 48 hours after the news broke.
What Ironwood changes
Ironwood's accounting rules are the key fix. They prevent any excess coins from continuing to circulate out of the old Orchard pool. From activation onward, holders get a verifiable supply ceiling — a hard cap that can be checked on-chain. User migrations from Orchard to the new Ironwood pool are visible, giving the network a transparent record of the transition. The upgrade effectively quarantines the old pool and starts fresh under stricter rules.
Market still skeptical
ZEC has been on a wild ride. On May 20, it surged 17% from $568 to $686 in six hours, triggering about $28 million in liquidations. But the gains didn't hold. The token reached $585.80 on July 15, then slid over 18% to $474 at publication. Open interest sits at $926.4 million, with 24-hour futures volume of $1.14 billion — about 12.7 times spot volume of $89.9 million. Over the past day, 53% of accounts were long and 47% short. That split suggests traders are betting on a rebound, but the price action says otherwise. ZEC trading below $500 signals the market still treats the Ironwood repair as unproven.
What to watch
The bull case for ZEC hinges on continued Ironwood migration, expanding spot turnover, and a close above $500. Key resistance levels sit at $500, $530, $550, $585.80, and the $595-600 zone. Until the market sees on-chain proof that the new supply ceiling holds and that the old pool is truly inert, ZEC is likely to stay range-bound. The next few weeks of migration data will tell the story.
