Zcash (ZEC) climbed 11% on Wednesday after developers agreed on a planned activation block for NU7, a major network upgrade that will cut target block times from 75 seconds to 25 seconds. The changes could make payments faster, increase network capacity and reshape how transaction fees support the privacy-focused blockchain’s long-term security.
ZEC advanced as traders reacted to progress toward the upgrade, which developers are targeting for early November. On October 21, CoinDesk reported that developers had agreed on block height 3,543,405, corresponding to approximately November 5, for NU7 activation on the mainnet.
The proposed block height represents an important step toward deployment, but the upgrade is not yet fully finalized. The activation proposal still requires integration into the deployment specification, and compatible node software must incorporate the selected parameters.
The headline change is a reduction in target block spacing from 75 seconds to 25 seconds. Under the current system, users wait an average of approximately 75 seconds for the first block confirmation. NU7 is designed to reduce that average wait to around 25 seconds.
The improvement could make Zcash more practical for point-of-sale payments, cryptocurrency exchange deposits and cross-chain transactions, where confirmation delays can create friction.
The benefits extend beyond the first confirmation. Exchanges and other services frequently require multiple confirmations before crediting deposits or releasing assets. Three confirmations currently take approximately 3 minutes and 45 seconds at the target block interval; under NU7, the equivalent target interval would fall to around 75 seconds.
However, faster block production does not automatically mean that every transaction becomes three times faster in every circumstance. Actual confirmation times depend on network conditions, and exchanges may impose their own security requirements.
The upgrade is also designed to improve network capacity. According to the Zcash Improvement Proposal for 25-second block spacing, the changes could more than double throughput for certain shielded transactions, while introducing limits intended to prevent excessive validation and synchronization demands on wallets.
NU7 also introduces changes to how transaction fees contribute to Zcash’s long-term security.
Under the proposed Network Sustainability Mechanism, 60% of transaction fees will be removed from circulation and placed in a reserve. A portion of that reserve is scheduled to be reissued through future block rewards beginning around February 2031.
The objective is to help support mining incentives as block subsidies decline through successive halvings. Bitcoin and other proof-of-work networks face a similar long-term question: whether transaction fees will eventually provide sufficient incentives to secure the network as newly issued rewards diminish.
Zcash’s proposal attempts to address that challenge while preserving its existing four-year halving schedule and 21 million ZEC supply cap. The changes are not designed to increase the total supply limit.
NU7 also adjusts block rewards to account for the more frequent blocks, keeping the rate of ZEC issuance broadly unchanged despite the shorter intervals.
Not every consequence of NU7 is positive for existing holders.
The upgrade will disable Zcash’s legacy Sprout transaction system. Because Sprout funds can only be transferred using an older transaction format that NU7 makes invalid, any coins remaining in that pool when the upgrade activates will become unspendable.
Reports have estimated that approximately $26 million worth of ZEC could be affected. Holders with funds in Sprout addresses will therefore need to move their assets to a supported pool before activation.
Most users are not expected to require significant wallet changes, but infrastructure operators—including full-node providers, indexers and block explorers—may need to upgrade their software. The official NU7 documentation provides further information on the planned transition.
The 11% price increase reflects investor interest in a major technical milestone, but it does not establish that ZEC has entered a sustained bullish trend.
Successful deployment could strengthen the investment case for Zcash by improving payment responsiveness and addressing long-term network economics. Conversely, implementation delays, technical problems or profit-taking after the rally could weaken momentum.
The key dates are now approaching quickly. Developers are targeting approximately November 5 for mainnet activation, subject to completion of the deployment process.
For traders, the next catalysts will be confirmation of the final activation parameters and evidence that the network can implement the changes successfully. For users, the priority is ensuring that any funds held in the legacy Sprout pool are transferred before the deadline.
NU7 is more than a speed upgrade. It represents a coordinated attempt to improve transaction performance, preserve Zcash’s monetary framework and prepare its security model for the years ahead. Whether those improvements translate into lasting demand for ZEC will depend on execution and actual adoption after launch.