Zcash Activates NU7 Upgrade to Triple Block Creation Speed
The network reduces block intervals to 25 seconds while implementing a new reserve mechanism.
1Network Upgrade Activation
The Zcash development team successfully activated the NU7 upgrade on the mainnet on November 5, 2024. This transition occurred at block height 3,543,405, marking a significant shift in the protocol's underlying architecture. The primary change involves reducing the target block interval from 75 seconds down to 25 seconds for faster processing.
2Maintaining Emission Schedules
To maintain the current ZEC emission rate and the total supply cap of 21 million coins, block subsidies were proportionally reduced by a factor of three. Simultaneously, the number of blocks between halving events was tripled. These adjustments ensure that the long-term economic model remains consistent with the original project design goals.
3Network Sustainability Mechanism
The NU7 upgrade introduces the Network Sustainability Mechanism, which redirects 60% of transaction fees into a public reserve. The remaining 40% continues to be distributed to miners. These reserved funds are scheduled to be gradually reintroduced into circulation through block rewards starting at block 8,939,664, which is currently estimated for 2031.
4Sprout Pool Deprecation
The update officially disables the legacy Sprout privacy pool, which was launched in October 2016. Because this pool relied exclusively on version 4 transactions, which are no longer supported, approximately 12,224 ZEC remaining in the pool have become inaccessible. This move reflects the transition toward more modern and secure privacy-preserving cryptographic solutions.
5Mining Difficulty Adjustments
The upgrade modifies the mining difficulty adjustment mechanism by extending the averaging window from 17 blocks to 102 blocks. This change aims to provide greater stability in block production times as the network adjusts to the new, faster cadence. Node operators were required to update their software prior to the activation date.
6Strategic Security Rationale
Shielded Labs, an independent organization supporting Zcash, stated that the new fee mechanism is designed to bolster network security as block rewards decline over time. By creating a sustainable reserve, the protocol aims to maintain its infrastructure integrity while strictly adhering to the established 21 million ZEC total supply limit.
7User Impact Assessment
While node operators were required to perform technical updates to remain on the consensus chain, most standard wallet users do not need to take any action. The protocol changes are primarily backend-focused, ensuring that the network remains functional and secure without disrupting the typical experience for holders of the ZEC cryptocurrency.
8Broader Market Context
This technical milestone follows recent market discussions, including reports from Grayscale regarding the potential growth of Zcash relative to Bitcoin. By modernizing its core architecture and addressing legacy technical debt, the Zcash project seeks to position itself for long-term viability within the competitive landscape of privacy-focused digital assets and blockchain protocols.
Original article: INCRYPTED — Zcash Activates NU7 Upgrade to Triple Block Creation Speed