Zcash is preparing to activate its Ironwood (NU6.3) network upgrade on July 28, marking one of the most significant protocol updates in the privacy-focused cryptocurrency’s history. The upgrade is designed to eliminate a critical vulnerability discovered earlier this year while reinforcing confidence in Zcash’s shielded transaction system.
Ironwood Upgrade Introduces New Shielded Pool
The Ironwood upgrade introduces a new shielded pool to replace the existing Orchard pool, where developers identified the so-called “infinity bug” in May. Although the flaw could have theoretically allowed counterfeit ZEC to be created, the Zcash development team has stated there is no evidence that the vulnerability was ever exploited.
As part of the upgrade, funds moving from the Orchard pool into the new Ironwood pool will pass through a turnstile accounting mechanism. The process is designed to verify the integrity of the circulating ZEC supply and prevent any unauthorized coins from entering the new shielded pool.
Zcash resumed normal block production in June after developers resolved a temporary network pause that occurred following the Orchard upgrade. The incident was quickly addressed, with the network restoring consensus and operations without compromising user funds or blockchain security.
Ecosystem Prepares for July 28 Activation
Zcash’s Ironwood mainnet activation height has been set and tagged! All of the major organizations are committed to activation of NU6.3 at height 3428143, which is approximately July 28th at 8AM EST.
— Sean Bowe (@ebfull) July 9, 2026
The activation was originally scheduled for July 21 but was postponed by one week after exchanges, wallet providers, mining pools, and infrastructure operators requested additional time to complete software upgrades. The network is now expected to activate Ironwood at block height 3,428,143, with deployment targeted for approximately 8:00 AM EST on July 28.
The delay also gives ecosystem participants more time to transition from the legacy zcashd software to the newer infrastructure stack, including Zebra, Zaino, and Zallet. Developers say the coordinated rollout aims to minimize disruption while ensuring broad compatibility across the network.
Ironwood is widely regarded as a pivotal upgrade for Zcash, strengthening the protocol’s privacy architecture while reinforcing safeguards around its monetary supply. A successful activation is expected to bolster confidence among users, exchanges, and developers following the disclosure of the Orchard vulnerability earlier this year.
Grayscale filed the first U.S. spot privacy coin ETF for Zcash in May, seeking SEC approval to list shares backed by ZEC. The proposed ETF aims to expand regulated investment access to Zcash while boosting institutional exposure to privacy-focused cryptocurrencies.
According to CoinMarketCap, Zcash (ZEC) was trading at approximately $502 as of 7:15 AM UTC. The cryptocurrency recorded a 7.78% gain over the previous 24 hours, reflecting continued buying momentum. Over the past seven days, ZEC climbed 15.32%, outperforming many major digital assets during the period. The gains come as investors closely monitor the upcoming Ironwood network upgrade, which is expected to strengthen Zcash’s privacy and security features.
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