Zcash Activates NU7, Cutting Block Times to 25 Seconds and Recycling Fees
Zcash’s NU7 upgrade is live, targeting a cut in block intervals from 75 seconds to 25 seconds and reducing the work wallets need to find private payments. It also directs at least 60% of transaction fees toward future mining rewards, with the funding plan and a separate aging privacy system raising questions for users.
Key takeaways
- Zcash activated its NU7 upgrade on November 6, 2026.
- NU7 targets 25-second blocks, down from the previous 75-second target.
- At least 60% of transaction fees will be set aside for future block rewards.
- The Network Sustainability Mechanism plans to reissue removed ZEC from 2031 within the 21 million supply cap.
- Separate reporting warns that about $16 million in an aging Zcash privacy system may be stranded when withdrawals close.
Zcash has activated NU7, an upgrade that targets a shorter interval between blocks—25 seconds, down from 75—and makes it easier for wallets to locate incoming private payments. The change is intended to make shielded ZEC payments feel more responsive without requiring users to understand the underlying system.
NU7 also changes how transaction fees support mining. At least 60% of fees are set aside to help fund future block rewards, under a plan that extends beyond the current reward schedule.
How does NU7 change Zcash payments?
A block is a batch of transactions added to the network. Reducing the target time between blocks to 25 seconds can mean faster inclusion for payments, while the wallet improvements reduce the work needed to detect private transfers. The upgrade’s timing target is a network design goal, not a promise that every payment will be fully confirmed in exactly 25 seconds.
For someone sending or receiving shielded ZEC, the practical change is less waiting for the wallet to notice a payment and potentially quicker transaction processing. The previous target was 75 seconds, so NU7 triples the intended block pace.
Why is Zcash recycling transaction fees?
NU7 introduces the Network Sustainability Mechanism, which recycles 60% of fees to support future block rewards. Decrypt reports that ZEC removed from circulation under the current schedule is intended to be reissued from 2031, while keeping total supply within Zcash’s 21 million cap.
This is a shift in how future mining rewards may be supported: rather than relying only on newly issued coins, the plan sets aside a substantial share of fees. The source reports that the community is debating the development fund, so the funding details remain a governance issue to watch—not simply a technical speed improvement.
What should Zcash users watch next?
The fee mechanism’s future implementation and the community’s debate over development funding are the clearest follow-ups. Users with funds in the aging privacy system mentioned in separate Decrypt reporting should also check its withdrawal timeline: that report warns the system will stop accepting withdrawals, potentially putting about $16 million in crypto at risk of being stranded. That issue is distinct from NU7’s speed improvements, but it makes checking which Zcash privacy system holds your funds especially important.
NU7’s broader significance is that this upgrade changes both everyday payment experience and the way the network plans to support miners after 2031. That combination makes the rollout more consequential than a simple block-speed adjustment.
Frequently asked questions
What is the Zcash NU7 upgrade?
NU7 is a Zcash network upgrade that targets 25-second blocks, reduces wallet work needed to find private payments, and sets aside at least 60% of transaction fees for future mining rewards.
Does NU7 make every Zcash payment confirm in 25 seconds?
No. Twenty-five seconds is the target interval between blocks, not a guarantee that every payment will be fully confirmed in that time.
What happens to Zcash transaction fees after NU7?
At least 60% of fees are assigned to the Network Sustainability Mechanism to help fund future block rewards. Decrypt reports that removed ZEC is intended to be reissued from 2031 within the 21 million supply cap.
Could Zcash users lose access to funds in an older privacy system?
Separate Decrypt reporting warns that an aging Zcash privacy system will stop accepting withdrawals and could leave about $16 million in crypto stranded. Users should verify whether their funds are held in that system and check its withdrawal timeline.