Privacy Coin Zcash to Launch NU7 Upgrade at Block Height 3543,405 with Approximately 12,226 ZEC Remaining in Sprout Pool

Coin Circle (120btc.CoM): According to the core technical plan of Zcash, the entire network has established that the NU7 mainnet upgrade will officially trigger at block height 3543405. Based on the hard constraints of the underlying improvement proposal ZIP 2003, after the upgrade is activated, the network will completely cease to accept and broadcast verification of version 4 (v4) transaction formats.

This adjustment of the underlying rules directly affects the circulation channels of historical funds. Since the initial privacy pool Sprout, which was launched alongside the mainnet genesis in 2016, only supports v4 format for signature calls, once nodes surpass the upgrade height, assets remaining in that pool will be unable to transfer out, even if they hold complete private keys, due to the lack of an effective network verification interface.

On-chain monitoring platform ZecStats reported as of November 5:

• Scale and Book Value: Currently, approximately 12,226 ZEC are still trapped in the Sprout privacy pool;

• Corresponding Fiat Asset Volume: If calculated based on the spot price of about $1,318 at that time from the block explorer Blockchair, the total amount of affected funds reaches approximately $16.1 million.

Regarding the nature of the disposal of these funds, ZIP 2003 clearly states that this adjustment essentially deprives Sprout tokens of their on-chain transfer and consumption capabilities, rather than physically destroying them at the ledger level; the related assets will still be fully counted in the issued circulation. Although the technical document mentions that theoretically, the v4 format could still be restarted through subsequent hard forks in the future, developers have clearly indicated that "the ability to utilize Sprout trapped funds may never be restored." The official has previously issued multiple safety warnings, urging all holders of "zc" prefix addresses to migrate their funds to newer privacy pools like Sapling or regular transparent accounts before the upgrade.

Block Generation Rhythm Calculation for Activation Window

From the perspective of the underlying computational state, the mainnet upgrade has entered a substantive countdown phase. Blockchair data shows that as of November 5 at 16:00 Beijing time, the latest block height across the network has risen to 3,542,521, leaving 884 blocks until the hard fork's preset activation threshold.

Combining the current network's established rate of producing a block every 75 seconds, the NU7 upgrade is expected to officially take effect around 10:30 AM Beijing time on November 6, with the actual implementation time slightly advanced or delayed depending on the real-time computational load and block generation speed of the entire network.

Ecological nodes and core software have completed key deployments:

• Core Client Full Compatibility: The Zcash Foundation confirmed in its engineering progress report on November 3 that the new generation node software Zebra 7.0.0 is fully compatible with the NU7 mainnet protocol and has simultaneously fixed seven known security vulnerabilities in the underlying network;

• Complete Clearance of Technical Debt: The early official client zcashd, which was the only one supporting the Sprout privacy protocol, has previously ceased maintenance;

• Reduction of Attack Surface: The technical team pointed out that the daily on-chain transaction volume of the Sprout pool has nearly dried up, but to maintain backward compatibility, the network's validating nodes have long retained a set of independent underlying code and verification logic, which in the past posed a potential distributed denial-of-service (DoS) attack risk. The removal of outdated code through this upgrade is a necessary step to enhance the mainnet's security resilience.

Block Interval Compressed to Twenty-Five Seconds

In addition to physically isolating legacy asset pools, the NU7 upgrade, which incorporates the ZIP 259 specification, also includes several significant restructurings of the underlying consensus and economic model:

• On-chain Settlement Confirmation Efficiency Doubled: The network aims to shorten block generation time from 75 seconds to 25 seconds, increasing the transaction confirmation speed on-chain to three times the original level, significantly optimizing the response time for privacy settlements;

• Establishment of Concurrent Throughput Protection Threshold: A new upper limit has been set for the number of transactions in individual privacy pools and across the network (Shielded Transactions) to prevent abnormal traffic from causing computational blockage for validating nodes;

• Activation of Network Perpetual Deflation Cycle: The transaction fee distribution system has been restructured, clearly designating 60% of on-chain transaction fees to be removed from circulation, and formally establishing a Network Perpetual Mechanism (NSM).

It is noteworthy that the above mechanisms accelerate the burning and consumption of tokens while still fully retaining the established four-year halving schedule. These reform directions were overwhelmingly approved in the community advisory committee and token holder referendum in September 2026; although ZIP 2003 and ZIP 259 are still labeled as "proposals" in technical archives, their core execution codes and upgrade trigger heights have been solidified in major node software, and the execution path has become rigid.

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