Zcash confirms July 28 Ironwood upgrade to shut Orchard bug
Zcash (ZEC) has confirmed the Ironwood network upgrade will activate on July 28 at block height 3,428,143 (around 8:00 a.m. EST). The NU6.3 change follows the Orchard shielded-pool vulnerability and is designed to close Orchard, route funds through an “accounting checkpoint,” and help determine whether any counterfeit ZEC could have been created.
The rollout was delayed by one week from the earlier July 21 target after concerns from Shielded Labs that exchanges, mining pools, and wallets might need more preparation time. Many services were also migrating from zcashd to the new Z3 stack (Zebra, Zaino, Zallet), which affected readiness.
Market context: after the Orchard disclosure on June 3, ZEC fell about 50% (from $602.68 to $299.25) before partially recovering; it was around $492.61 at the time of writing. Separately, ZEC supply reached 16,806,723 (over 80% of the 21M max). Traders may watch for volatility around the July 28 Ironwood timing as the upgrade attempts to reduce lingering uncertainty tied to the bug.
Neutral
The confirmation reduces technical uncertainty by defining the exact Ironwood (Zcash) activation time and the mechanism to close Orchard and add an accounting checkpoint. That can support sentiment ahead of the July 28 event. However, the news comes after a sharp prior drop tied to the Orchard incident, so traders may still price risk around migration readiness (zcashd to Z3 stack) and execution details. Net effect is likely mixed: modestly supportive for ZEC on clarity, but not a clear catalyst for sustained upside on its own.