All Eyes on July 28 as Zcash Rolls Out Security Upgrade

Zcash set for major upgrade to strengthen ZEC supply security.

Tomiwabold Olajide · 27 Jul 2026 · 5 min read

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All Eyes on July 28 as Zcash Rolls Out Security Upgrade

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By
Tomiwabold Olajide

Mon, 27/07/2026 – 14:30

Zcash set for major upgrade to strengthen ZEC supply security.

All Eyes on July 28 as Zcash Rolls Out Security Upgrade

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The crypto community is currently counting down as Zcash is expected to activate its Ironwood network upgrade at block height 3,428,143 on July 28.

In a recent X post, the Zcash Open Development Lab (ZODL) shared a countdown to the Ironwood upgrade. In a post on July 26, ZODL wrote, “T-2 days until Ironwood is live on mainnet. Privacy shouldn’t require sacrificing verifiability. Ironwood ensures both.”

Zcash to Activate Ironwood Upgrade With New Shielded Pool and Supply Safeguards

Zcash is expected to activate its Ironwood network upgrade at block height 3,428,143 on July 28. The upgrade introduces a new shielded pool with quantum-recoverable notes and a turnstile mechanism… pic.twitter.com/CuFQ0RMAmt

— Wu Blockchain (@WuBlockchain) July 27, 2026

Ironwood is a Zcash network upgrade intended to make it possible for every user to independently verify the soundness of Zcash’s circulating supply. It is scheduled to activate as NU6.3 at block height 3,428,143, at about 12:00 p.m. UTC on July 28.

Ironwood was designed in response to a critical counterfeiting vulnerability discovered by Shielded Labs security researcher Taylor Hornby in Zcash’s Orchard shielded pool. The vulnerability was fixed through an emergency network upgrade led by the Zcash Open Development Lab (ZODL), which believes it was unlikely to have been exploited.

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