Zcash NU7 Testnet Goes Live: What Changes Before Mainnet?

Zcash activated its NU7 network upgrade on the public testnet on 4 October 2026 at block height 4,465,026, roughly two days ahead of the originally estimated 6 October date. 

The upgrade cuts block times from 75 seconds to 25 seconds, introduces a fee recycling mechanism, and retires the Sprout shielded pool. 

Backed by a coinholder vote that drew 2.4 million ZEC in participation, NU7 represents the most significant protocol change since the Ironwood upgrade. Mainnet activation is targeted for 5 November 2026.

Key Takeaways

• NU7 activated on testnet on 4 October 2026 at block 4,465,026, cutting block times from 75 seconds to 25 seconds.
• The upgrade introduces a Network Sustainability Mechanism that removes 60% of transaction fees from circulation, with recycling beginning in February 2031.
• Mainnet activation is targeted for 5 November 2026, pending a final decision on activation height on 20 October.

What Does the Zcash NU7 Upgrade Change?

The headline change in NU7 is ZIP 218, which reduces target block spacing from 75 seconds to 25 seconds. 

This allows the network to produce roughly three blocks during the interval currently targeted for one. 

Estimated throughput for standard Orchard transactions increases from approximately 2.9 transactions per second to 6.6, while worst case shielded sync bandwidth for light clients drops from roughly 270.5 MB to 169.1 MB per day.

The faster block schedule also triples the remaining halving intervals, keeping daily issuance unchanged despite the increased block frequency. This preserves the existing ZEC mining economics while delivering faster confirmations.

NU7 introduces per block shielded action limits designed to control validation costs as block production becomes more frequent.

Here is what the limits include:

• 330 Orchard or Ironwood operations per block.
• 300 Sapling inputs and outputs per block.
• A shared budget of 330 actions across all shielded pools.
• No new Sprout JoinSplits permitted.

The Network Sustainability Mechanism is the second major component. Under ZIP 235, at least 60% of transaction fees are removed from circulation rather than paid directly to miners. 

The remaining 40% goes to miners as usual. The removed ZEC is not permanently burned. It is recycled through future block rewards starting in February 2031, providing a reserve to maintain network security as block subsidies decrease through successive halvings.

NU7 also disables version 4 transactions, which effectively retires the Sprout shielded pool. Users with ZEC still held in Sprout must migrate their funds before mainnet activation, as spending from Sprout relies on version 4 transactions.

The coinholder vote that shaped these decisions drew 2.4 million ZEC, representing 66% of the eligible pool. Support was decisive: 98.9% backed the halving schedule and 96.6% favoured February 2031 as the fee reintroduction date.

Start trading ZEC and explore the full Zcash ecosystem when you create a free account on Bitrue today.

What Is the NU7 Mainnet Timeline?

The testnet activation on 4 October is the first major public milestone. The upgrade shipped through Zebra 7.0.0 rc.0, a release candidate published on 2 October 2026. Testnet operators were advised to upgrade both their node software before the target block height.

Here is the current schedule:

• Code completion: 30 September 2026 (met).
• Zebra 7.0.0 rc.0 release: 2 October 2026 (shipped).
• Testnet activation: 4 October 2026 at block 4,465,026 (live).
• Mainnet activation decision (including exact block height): 20 October 2026, one week before Zcon.
• Mainnet target: 5 November 2026 (conditional on testnet results).

Developers plan to review testnet performance for approximately two weeks following activation. If testing proceeds without critical issues, the final mainnet activation height will be confirmed on 20 October. Mainnet operators do not need to take any action until that decision is made.

This upgrade does not introduce new transaction formats and is not expected to require changes from most wallet users. 

However, infrastructure operators running full nodes, indexers, and block explorers may need adjustments to accommodate the faster block schedule and updated fee mechanics. 

The ZEC price outlook heading into mainnet will depend heavily on how smoothly the testnet phase progresses.

How to Trade Zcash (ZEC) on Bitrue

ZEC is available for trading on Bitrue across spot and futures markets. Traders looking to position ahead of the NU7 mainnet activation can access ZEC trading tools through a straightforward process.

Here is how to get started:

1. Create a Bitrue account and complete identity verification (KYC).
2. Fund your account using a bank transfer, card payment, or crypto deposit.
3. Navigate to ZEC trading pairs and select your preferred market.
4. Place a market order for immediate execution or a limit order at your target price.
5. Store purchased ZEC in your Bitrue wallet or withdraw to a self custody wallet for holding.

Bitrue also offers AI powered strategy tools and staking options for traders who want broader exposure to privacy focused crypto assets.

Conclusion

The Zcash NU7 upgrade is now live on testnet, delivering 25 second blocks and a restructured fee mechanism for the first time under real conditions. 

With a mainnet decision scheduled for 20 October and activation targeted for 5 November 2026, NU7 is on track to become one of Zcash's most impactful protocol upgrades. 

The combination of faster confirmations, improved throughput, and a sustainability reserve positions ZEC for a new chapter. 

Traders and holders can explore ZEC opportunities on Bitrue while monitoring the institutional landscape around Zcash as mainnet approaches.

FAQ

When Did the Zcash NU7 Testnet Activate?

NU7 activated on the public testnet on 4 October 2026 at block height 4,465,026, ahead of the originally estimated 6 October date.

What Is the Zcash NU7 Mainnet Date?

Mainnet activation is targeted for 5 November 2026, pending a final decision on the activation block height on 20 October.

What Is ZIP 218?

ZIP 218 reduces Zcash target block spacing from 75 seconds to 25 seconds, tripling block frequency while keeping daily issuance unchanged.

What Happens to the Sprout Shielded Pool?

NU7 disables version 4 transactions, effectively retiring the Sprout pool, so users must migrate any remaining Sprout funds before mainnet activation.

Do ZEC Holders Need to Do Anything?

Most ZEC holders do not need to take action, but users with funds in the Sprout shielded pool must migrate before the mainnet upgrade activates.

Disclaimer: The views expressed belong exclusively to the author and do not reflect the views of this platform. This platform and its affiliates disclaim any responsibility for the accuracy or suitability of the information provided. It is for informational purposes only and not intended as financial or investment advice.