Zcash NU7 Goes Live on Testnet as 25-Second Blocks Move Closer to Mainnet
Zcash has successfully deployed the NU7 hard fork onto its testnet, introducing faster 25-second block times, enhanced shielded transaction features, and the Network Sustainability Mechanism ahead of a potential November mainnet launch.
Zcash has deployed the NU7 network hard fork onto its testnet, bringing faster 25-second block times, enhanced shielded transaction features, and additional upgrades.
Ahead of schedule, NU7 went live on the testnet at block 4,465,026 on October 4. This provides a testing period before the network determines whether to deploy NU7 on the primary Zcash network.
Zcash NU7 Tests 25-Second Blocks Ahead of November Target
A central consensus modification in NU7 shortens the target block spacing from 75 seconds down to 25 seconds. If adopted on the main Zcash network, this change lowers the expected block count during the current block target spacing interval to three, bringing average first-block confirmation times down from 75 seconds to 25 seconds.
This upgrade seeks to enhance transfer speeds for payments, deposits, and cross-chain transactions. Even though blocks will form more quickly, the overall ZEC supply will not triple.
To keep a consistent overall issuance rate despite the higher frequency of blocks, the protocol adjusts block rewards. NU7 lengthens the difficulty averaging period by 102 blocks to better preserve long-term issuance stability alongside an increased volume of blocks per unit of time.
Additionally, NU7 places restrictions on shielded transactions within every block. According to the Zcash Foundation, these rules are designed to boost shielded transaction capacity and minimize the peak verification burden that spam transactions might impose on lightweight wallets.
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Released on October 2, Zebra 7.0.0-rc.0 provided support for NU7 on the public testnet, encouraging node operators to test the release within a live network setting.
Developers now have an active environment to assess how the revised consensus rules impact miners, wallet apps, alternative node software, and transactions. Because a definitive mainnet activation height has not yet been selected, production nodes have not been asked to upgrade.
Zcash Adds Network Sustainability Mechanism With NU7
The Network Sustainability Mechanism, or NSM, serves as another core component. Under NU7, 60% of transaction fees are removed from circulation and placed into an account reserved for future emission costs, while miners receive the remaining 40%.
Furthermore, the upgrade will disable version 4 transactions on the live network. This adjustment could impact users holding ZEC within Sprout shielded addresses, since Sprout withdrawals rely on version 4 transactions. Holders of ZEC in Sprout shielded addresses may wish to withdraw their coins prior to the mainnet launch to maintain access.
Drawing from Ironwood-related proposals introduced by other network participants, NU7 represents another major protocol evolution for Zcash consensus rules. At present, the upgrade operates exclusively on the public testnet, allowing infrastructure providers and network participants to test it prior to mainnet activation.
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A mainnet rollout is targeted for November 5, though it remains unconfirmed. On October 20, developers will review testnet findings to determine whether to proceed with the mainnet launch and establish the activation block height. Until then, NU7 remains strictly a testnet upgrade rather than an active modification to the Zcash mainnet.
Frequently Asked Questions
What is Zcash NU7?
NU7 is a network hard fork designed to introduce faster block times, updated shielded transaction capabilities, a Network Sustainability Mechanism, and other protocol improvements to Zcash.
How do block times change under NU7?
The target block spacing decreases from 75 seconds to 25 seconds, reducing average first-block confirmation times from 75 seconds to 25 seconds.
Will the ZEC supply triple because of faster blocks?
No. The protocol modifies block rewards and lengthens the difficulty averaging period by 102 blocks to preserve long-term issuance stability despite the higher block frequency.
What is the Network Sustainability Mechanism (NSM)?
The NSM directs 60% of transaction fees away from circulation and into an account dedicated to funding future emission costs, leaving the remaining 40% for miners.
When is NU7 expected to launch on the mainnet?
A mainnet rollout is tentatively planned for November 5, pending a review of testnet results by developers scheduled for October 20.
Web3 PR Specialist | KOL | Blockchain Advocate | Digital Strategy Expert based in Moscow, Russia. Focused on Web3 communications, blockchain, digital strategy, and community growth.
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