Zcash's NU7 network upgrade went live on Tuesday, shortening the target time between blocks to 25 seconds and reducing the computational work wallets must perform to locate private payments. The upgrade also sets aside a portion of transaction fees for future miners, according to the Zcash development team.
Faster Blocks, Lighter Wallets
The new 25-second block target replaces the previous interval, which was longer. For everyday users, the change means transactions should confirm more quickly. The upgrade also cuts the work wallets must do to find private payments—a notable adjustment for a network built around shielded transactions. In practice, that could mean less strain on wallet software when scanning the blockchain for incoming funds, though the development team did not provide specific performance metrics.
A Fee Pool for Miners Who Aren't Here Yet
NU7 sets aside fees for future miners. The mechanism reserves a portion of transaction fees rather than distributing them immediately to current block producers. The development team described the move as a way to support the network's long-term security budget, though it did not detail how the reserved fees will be released or managed. The change is part of the upgrade's broader adjustments to Zcash's economics, which have been a topic of debate within the community.
What NU7 Changes Under the Hood
Beyond block times and fee allocation, NU7 includes a series of technical modifications designed to improve efficiency. The reduced wallet workload for private payments is tied to changes in how shielded notes are scanned. Wallets will need to update to remain compatible with the new network rules. Users running older node software may find themselves out of sync until they upgrade, a standard consequence of a network-wide activation.
The Zcash development team confirmed the upgrade activated without incident. No timeline was given for when the reserved fee pool might begin affecting miner rewards, and the team did not specify whether further changes to the fee structure are planned.
Wallet Updates and Network Compatibility
With NU7 live, wallet providers and node operators are expected to release compatible versions. The development team urged users to check for updates from their wallet vendors. Exchanges and custodial services that support Zcash will also need to adjust their infrastructure. The upgrade's activation means any service still running pre-NU7 software is now on a separate chain and won't be able to process transactions correctly until updated.
The 25-second block target is the most visible change for end users, but the wallet workload reduction may prove more consequential for private payment adoption. The team did not say whether the faster block time increases the risk of orphaned blocks or how it affects network bandwidth. Those details are likely to emerge as the network runs under the new parameters.
Next Steps for Node Operators
Node operators who haven't upgraded should do so promptly to stay on the main chain. The development team has not announced a deadline for mandatory upgrades, but network compatibility depends on running the latest software. Wallet providers are expected to publish their own compatibility notes in the coming days. For now, the upgrade is live, and the network is producing blocks on the new schedule.
