Zcash activates Network Upgrade 7 (NU7) at block height 3,543,405 on approximately November 5, 2026. The upgrade cuts block intervals from 75 to 25 seconds, introduces a fee-recycling mechanism that removes 60% of transaction fees from circulation until 2031, retires the original Sprout shielded ...
Zcash activates Network Upgrade 7 (NU7) at block height 3,543,405 on approximately November 5, 2026. The upgrade cuts block intervals from 75 to 25 seconds, introduces a fee-recycling mechanism that removes 60% of transaction fees from circulation until 2031, retires the original Sprout shielded pool — stranding an estimated 22,263 ZEC (roughly $27.9 million at current prices) — and imposes new per-block transaction limits. A September coinholder vote backed the changes with 99.9% support from 2.4 million participating ZEC, the largest governance action in the protocol's history. The upgrade lands amid a parallel governance crisis over $124 million in grant funding and a co-founder proposal to redirect 8% of block rewards away from community grants toward a mining reserve.
At $1,253 per ZEC and a $21.2 billion market capitalization as of November 2, 2026, Zcash enters NU7 after a 1,570% rally from $75 in October 2025. Daily miner revenue stands at approximately $2 million. Grayscale reports that Zcash mining revenue per unit of electrical power is four times that of Bitcoin, and Foundry launched a dedicated Zcash mining pool in April 2026. The network hash rate sits near 28–30 GH/s.
NU7 bundles four categories of protocol change into a single hard fork:
| Change | Specification | Effect | |--------|--------------|--------| | Block time reduction | ZIP 218 | 75s → 25s target interval | | Fee burning | ZIP 233, 234, 235 | 60% of tx fees removed from circulation | | Fee recycling to miners | ZIP 237 | Burned fees return to block rewards starting Feb 2031 | | Sprout retirement | ZIP 2003 | Version 4 transactions disabled; Sprout pool frozen | | Per-block limits | Various | New transaction caps to reduce spam and lightweight-wallet bandwidth |
The upgrade activates at mainnet block height 3,543,405. Node operators must run Zebra 7.0.0 or later, released October 22, 2026. The Zakura testnet activated NU7 at block 4,465,026 in early October without incident.
ZIP 218 reduces the target block interval from 75 seconds to 25 seconds — a 3x improvement in confirmation speed. The block subsidy remains at 1.5625 ZEC per block, and the four-year halving schedule is unchanged. Because blocks arrive three times faster, the effective issuance rate per unit time triples briefly, but the 21 million ZEC hard cap is unaffected because the subsidy was proportionally adjusted.
The practical effect: a single-confirmation transaction that currently takes 75 seconds on average will settle in roughly 25 seconds. For merchants and exchanges requiring multiple confirmations, the improvement compounds. A six-confirmation wait drops from 7.5 minutes to 2.5 minutes.
Worst-case bandwidth usage directed at lightweight wallets — a category of spam attack that has plagued privacy chains — is projected to fall approximately 37% under the new per-block limits, according to developer specifications in the upgrade documentation.
NU7 introduces the Network Sustainability Mechanism (NSM), defined across ZIPs 233, 234, 235, and 237. The mechanism addresses a long-term problem facing all fixed-supply proof-of-work chains: as block subsidies decrease through halvings, miner revenue depends increasingly on transaction fees. If fee revenue proves insufficient, hash rate declines, and with it, network security.
The NSM works as follows:
The September 2026 coinholder vote endorsed this timeline. Holders voted 96.6% to delay reissuance until February 2031, allowing several years of fee accumulation before any redistribution. This creates a deflationary window: between November 2026 and February 2031, 60% of all transaction fees are effectively burned with no offsetting issuance.
The total ZEC supply remains capped at 21 million. The mechanism does not create new tokens; it redistributes existing fee revenue across time.
ZIP 2003 retires Zcash's original privacy system. Sprout, launched with the network in October 2016, uses a different zero-knowledge proof construction than the newer Sapling and Ironwood pools. The upgrade disables version 4 transactions — the only transaction format capable of spending Sprout notes.
As of November 2, 2026, ZecStats data shows 22,263.34 ZEC remaining in the Sprout pool, valued at approximately $27.9 million. Only 374 ZEC (1.65%) left the pool over the preceding 92-day period, indicating that the majority of Sprout holdings are either lost keys, abandoned wallets, or holders unaware of the deadline.
After activation, funds in the Sprout pool cannot be moved. ZIP 2003 states that "in theory, it may be reopened in the future, but it may never be restored." The ambiguity is deliberate: the specification neither destroys the balances nor guarantees future access.
The decision has generated criticism. Opponents argue that freezing funds held by users who control their own private keys — solely due to a protocol upgrade — contradicts the self-sovereignty principles that privacy coins claim to uphold. Supporters counter that Sprout's cryptographic primitives are outdated, that the pool has been deprecated since 2018's Sapling upgrade, and that eight years of notice is sufficient.
The September 2026 governance vote was the largest in Zcash history by voting weight. Approximately 2.4 million ZEC participated, double the 1.2 million ZEC that voted in February 2026. Organizers had set a 1 million ZEC minimum for the result to be considered representative.
Key results:
| Question | For | Against | Participation | |----------|-----|---------|---------------| | 25-second blocks | 99.9% | 0.1% | 2.4M ZEC | | Retain 4-year halvings | 98.9% | 1.1% | 2.4M ZEC | | Delay NSM reissuance to Feb 2031 | 96.6% | 3.4% | 2.4M ZEC |
Of the approximately 3.6 million spendable ZEC in the Ironwood shielded pool (which replaced Orchard), 2.4 million participated — a 67% turnout rate.
The voting mechanism itself is notable. Only ZEC held in the Ironwood pool could participate. Ballots were encrypted and split into 16 unlinkable pieces using a protocol designed by Valar Group developer Dev Bharel, allowing validators to tally results without reconstructing which holder cast which vote or the size of their stake. The system preserved voter privacy while weighting votes by economic stake.
NU7 activates against a backdrop of governance turmoil over Zcash Community Grants (ZCG), the body that distributes a portion of block rewards to ecosystem development.
The dispute escalated in late October 2026 when a major holder operating under the pseudonym "big z" announced a full liquidation of ZEC holdings. The trigger: ZCG's launch of the Zcash Adoption Pool program, which directed grants toward integrating underbanked populations, including refugees. Critics characterized this as mission creep from a cryptographic-engineering fund.
Co-founder Sean Bowe published a proposal on October 27 to end the automatic 8% allocation of newly minted ZEC to ZCG and redirect those funds to a reserve for future mining rewards. With ZCG holding an estimated $125 million treasury, Bowe argued the existing balance was sufficient to fund operations without ongoing issuance.
ZCG itself then proposed redirecting approximately $124 million in existing and future funding toward mining rewards — an attempt to pre-empt the co-founder's plan while retaining organizational authority over the process.
Gemini co-founder Tyler Winklevoss questioned whether ZCG was qualified to manage $110 million, according to reporting by The Cryptonomist. Helius CEO Mert Mumtaz called the ZCG counter-proposal "nowhere near good enough." The controversy remains unresolved as NU7 approaches.
The economic significance: the 8% block-reward allocation currently channels roughly $160,000 per day (at current ZEC prices) to ZCG. Redirecting this to mining rewards would increase direct miner compensation by approximately 8% while eliminating the protocol's primary development-funding mechanism.
ZEC traded at $1,253 on November 2, 2026, with a market capitalization of $21.2 billion and a circulating supply of 16.9 million ZEC. The token has risen approximately 1,570% from $75 in October 2025.
Mining economics:
The Grayscale Zcash Trust filed its fifth S-3/A amendment with the SEC in October 2026. A spot ZEC ETF recorded $1.61 million in net inflows on October 21.
ZEC's Q3 2026 on-chain fee revenue rose 85% to approximately $204,000, according to Blockworks' Zcash Token Holder Report. This figure — $204,000 in quarterly fees against a $21 billion market cap — yields a fee-to-market-cap ratio of 0.001%, underscoring the protocol's dependence on block subsidies rather than organic transaction demand for miner compensation.
NU7 is Zcash's most consequential upgrade since Sapling in 2018. The block-time reduction and fee-recycling mechanism address legitimate structural concerns: confirmation speed that lagged competitors and a miner-revenue cliff that halving schedules make inevitable. The governance vote demonstrated meaningful participation through a privacy-preserving mechanism.
The Sprout freeze, however, sets a precedent that the protocol can render user-held funds unspendable through consensus change. Whether 22,263 ZEC is a rounding error or a violation of self-custody principles depends on one's framework. The protocol's architects chose the former interpretation.
The grant controversy introduces a separate variable. If the 8% block-reward allocation shifts to mining rewards, Zcash loses its only protocol-level funding mechanism for development. The $125 million treasury provides runway, but treasuries deplete. The network would then rely entirely on voluntary contributions and external grants — a model that has not sustained long-term development at comparable protocols.
The underlying economic tension is quantifiable: $204,000 in quarterly fees supporting a $21 billion market cap. The NSM is a structural acknowledgment that transaction demand alone will not fund network security for decades. Whether deferred fee recycling resolves this or merely delays the reckoning depends on whether Zcash generates materially more transaction volume before 2031.