Zcash NU7 Upgrade Set for November 5th, Faster Payments Expected

Zcash Set for Major Upgrade, NU7 to Slash Block Times and Retire Old Privacy System

Zcash developers have proposed a significant network upgrade, NU7, slated to activate on block 3,543,405, with an estimated mainnet launch on November 5th. The upgrade aims to drastically reduce block times from 75 seconds to 25 seconds, accelerating transaction confirmations from nearly four minutes to approximately 75 seconds. Concurrently, the original Sprout privacy system will be decommissioned, and 60% of block fees will be temporarily removed from circulation. The Zakura node dashboard has already been updated to reflect these changes.

The NU7 upgrade proposal was put forth by Zcash developer Sean Bowe on Tuesday, setting block 3,543,405 as the target for mainnet activation, anticipated around November 5th. This marks the first major overhaul for the Zcash privacy chain since the Ironwood upgrade. The core enhancement is a threefold increase in transaction speed, achieved by reducing block times from 75 seconds to 25 seconds.

The NU7 upgrade has already undergone testing on the Zcash testnet. The public upgrade dashboard for Zakura node software also lists block 3,543,405 as the projected mainnet launch point.

The reduction in block time from 75 seconds to 25 seconds means that exchanges will be able to credit ZEC deposits after three confirmations in approximately 1 minute and 15 seconds, a significant improvement from the previous nearly four minutes. This enhancement is expected to provide a noticeably better user experience for both individual investors and exchanges. The Zakura node software’s public upgrade dashboard has designated this block height as the mainnet activation point, with current testnet operations proceeding smoothly.

However, accelerated block times are not the sole change. NU7 will also divert 60% of block fees from circulation. These funds will be held until February 2031 before being returned to miners, ensuring that Zcash’s existing halving schedule remains unaffected.

More critically, Zcash’s foundational Sprout privacy system will be entirely shut down. Any tokens held within the Sprout system that are not transferred out by November 5th will become inaccessible.

Bowe’s proposal has garnered support from two other developers. However, as of Wednesday 08:00 UTC, it has not yet been formally merged into the deployment specifications, which still list the mainnet activation block as “undetermined.” The upgrade will only become fully effective once node software incorporates the specified block height and is updated accordingly.

Previous reports indicated that the Zcash NU7 upgrade went live on the testnet in mid-October, with an anticipated mainnet launch on November 5th. This latest proposal effectively transitions the “estimated date” to a “confirmed block height,” with only the final code merge and node deployment remaining before the official upgrade.

Zcash has undergone several upgrades in 2026, including the launch of the new Ironwood node client, the implementation of the Zakura quantum-resistant solution, and now the NU7 block time acceleration. The significance of this upgrade lies in its impact on the network’s infrastructure. Faster block times translate to quicker on-chain transaction confirmations, directly benefiting the real-time nature of private transactions. Furthermore, the decommissioning of the Sprout system represents a step towards streamlining Zcash’s privacy computations by shedding historical baggage.

Future observations will focus on two key areas: first, whether the actual mainnet block intervals will consistently remain at 25 seconds post-launch, as testnet performance does not always guarantee mainnet stability; and second, the capital flows into Grayscale’s Zcash Trust (ZCH) on the US stock market. A successful NU7 upgrade could potentially act as a catalyst for increased retail investor participation. The synchronization speed of the Zakura node software also serves as an indicator; any delays in node upgrades could lead to a postponement of the mainnet transition.