All Eyes on July 28 as Zcash Rolls Out Security Upgrade

Cover image via U.Today Disclaimer: The opinions expressed by our writers are their own and do not represent the views of U.Today. The financial and market information provided on U.Today is intended for informational purposes only. U.Today is not liable for any financial losses incurred while trading cryptocurrencies. Conduct your own research by contacting financial experts before making any investment decisions. We believe that all content is accurate as of the date of publication, but certain offers mentioned may no longer be available. 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. Advertisement 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. Advertisement 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. HOT Stories Coinbase CEO Rejects 'Pivot to AI' Narrative Zcash (ZEC), XRP, Shiba Inu (SHIB) and Bitcoin (BTC) Price Analysis for July 26: Liquidity Chooses Wrong Direction You Might Also Like Fri, 06/12/2026 - 10:00 Zcash Ironwood: What to Expect and How Biggest Controversies Are Being Resolved By Arman Shirinyan Given that Orchard's transaction data is shielded, users cannot independently verify that no counterfeit ZEC was created before the vulnerability was fixed. Ironwood addresses this problem by creating a new shielded pool using the corrected Orchard circuit and sealing the original Orchard pool. Advertisement Following the Ironwood upgrade, users will no longer be able to send or receive ZEC inside the Orchard pool. Funds will only be able to leave through Zcash's existing turnstile, which prevents more ZEC from exiting the pool than legitimately entered it. Why Ironwood matters Ironwood retires the Orchard pool and seals the original pool, replacing it with a new pool using the corrected Orchard circuit. You Might Also Like Fri, 07/10/2026 - 10:59 Zcash (ZEC) Surges 28% in Volume, Beating Bitcoin, Ethereum and Hyperliquid By Arman Shirinyan The upgrade also prevents hypothetical counterfeit value from increasing Zcash 's circulating supply. Following the Ironwood upgrade, funds can only exit the original pool through the turnstile. Ironwood also provides independently verifiable soundness whereby anyone running a node can verify that Zcash's supply limits are being enforced. Temporary service interruptions may be possible during the Ironwood upgrade, as exchanges, wallets, or other service providers that are not fully prepared for the transition may temporarily suspend deposits, withdrawals, or other services. #ZCash News #Zcash