Zcash is gearing up for its NU7 mainnet upgrade, scheduled for November 5th, which aims to significantly reduce block processing times to 25 seconds while integrating a mechanism to preserve its future halving schedule. The upgrade follows a planned testnet launch on October 6th.
The NU7 upgrade will decrease Zcash’s target block spacing from the current 75 seconds to 25 seconds. This adjustment includes the disabling of version 4 transactions and the implementation of the Network Sustainability Mechanism (NSM). According to Zcash developer Sean Bowe, the NSM is configured to maintain Zcash’s halving schedule, with a provision for reintroducing previously removed supply beginning in February 2031.
Community support for the upgrade is robust, as evidenced by recent voting results. ZEC holders overwhelmingly backed the proposed changes, with approximately 98.9% supporting the preservation of the halving schedule and 99.9% of the Zcash (ZEC)-weighted vote in favor of the faster-block proposal. A definitive decision on the mainnet upgrade and its activation height is slated for October 20th, pending an evaluation of NU7’s performance on the testnet.
Sean Bowe noted that NU7 is not expected to introduce new transaction formats and should have minimal impact on user wallets. However, he cautioned that full nodes, indexers, and block explorers may require adjustments to accommodate the upcoming changes. The precise activation height for the mainnet upgrade remains contingent on the testnet performance assessment.
This upgrade arrives amid a notable increase in ZEC’s market activity. On Thursday, ZEC experienced a price rise of approximately 20% within a 24-hour period. This trend is part of a broader outperformance in the privacy coins sector, which, according to Glassnode data, was 213% above its level at Bitcoin’s October 2025 peak. A basket of privacy coins excluding ZEC has seen an 85% increase over the past year.
The NU7 upgrade signifies a substantial technical and economic evolution for Zcash. Its successful implementation will depend on a smooth deployment and the long-term efficacy of the NSM in managing the network’s economic model, all underpinned by strong community backing.
Why This Matters
The materials describe a narrow update: Zcash developers are targeting November 5th for the NU7 mainnet upgrade, which will reduce block times from 75 seconds to 25 seconds, disable version 4 transactions, integrate the Network Sustainability Mechanism (NSM) to preserve the halving schedule, and reintroduce removed supply starting February 2031. Full nodes, indexers, and block explorers may require adjustments due to NU7.
Broader Context
Source materials place the factual news in this context: NU7 will cut Zcash block times to 25 seconds and preserve its halving schedule, with testnet activation planned for Oct. 6.
