Zcash Targets November for NU7 Mainnet Upgrade With 25-Second Blocks
Zcash developers are targeting November 5 for the NU7 mainnet activation after unanimous agreement among organizations and engineering teams on its contents and timeline. The upgrade will reduce block intervals from 75 to 25 seconds, disable version 4 transactions, and integrate the Network Sustainability Mechanism (NSM), preserving the halving schedule through 2031. ZEC holders overwhelmingly supported these changes. The testnet launch is scheduled for October 6, with final mainnet decisions on October 20.
Upgrade Plan and Timeline
Zcash developers announced that the testnet for the NU7 upgrade is set to launch on October 6. Following evaluation of the testnet performance, a final decision regarding mainnet activation and block height is scheduled for October 20.
The mainnet upgrade is targeted for November 5, 2024, pending successful testing. This timeline reflects unanimous agreement among organizations and engineering teams involved with the project.
Technical Changes in NU7
The NU7 upgrade will reduce the target block interval from the current 75 seconds to 25 seconds, accelerating transaction processing and blockchain updates.
Additionally, the upgrade will disable version 4 transactions and integrate the Network Sustainability Mechanism (NSM). Under the selected NSM configuration, the existing halving schedule will be preserved, with previously removed supply set to be reintroduced starting February 2031.
Community Response and Infrastructure Impact
Community voting among ZEC holders showed overwhelming support: 98.9% favored maintaining the halving schedule, and 99.9% supported the shorter block interval.
Developer Sean Bowe noted that NU7 will not introduce new transaction formats, so wallet functionality should remain largely unaffected. However, full nodes, indexers, and block explorers might require updates to accommodate the new parameters.
Market Context
In the wake of the upgrade announcement, ZEC price surged approximately 20% within 24 hours, significantly outperforming the broader market.
According to Glassnode data, the privacy coin sector has experienced substantial growth, rising 213% above Bitcoin's October 2025 peak level. A basket of privacy coins excluding ZEC increased roughly 85% over the past year.
Why it matters
The announced NU7 upgrade, which reduces block intervals to 25 seconds while preserving the halving schedule, will significantly enhance Zcash's transaction speeds and ensure network sustainability through the NSM feature. The unanimous support from the community and organizations reflects strong alignment behind key technical enhancements. This development is important for the privacy coin market, as ZEC's price surge amid favorable sector trends may drive further network growth and competitiveness.
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