Zcash’s public testnet began producing 25-second blocks on October 5, reaching NU7’s activation height a day before the October 6 date previously expected. The shorter interval will be visible to users, but the next few weeks are really about whether the services around Zcash can operate smoothly at the new pace.
Key Takeaways
- NU7 has reduced Zcash’s public-testnet block target from 75 seconds to 25 seconds.
- The live run gives wallets, exchanges, miners and node operators time to check compatibility before mainnet.
- Faster blocks shorten the wait for a first confirmation but do not make settlement instant.
- ZEC issuance, the halving schedule and the 21 million supply cap remain unchanged.
Faster blocks only help if the services around them keep up
The October 5 activation puts NU7’s new consensus rules onto Zcash’s shared public testnet. Zcash Foundation’s Zebra release had set the change at block height 4,465,026, expected around October 6. The network reached that height early, while the proposed November 5 mainnet date still depends on the results of the live run.
Producing three times as many blocks affects more than the countdown to a payment confirmation. Full nodes must validate them, miners must build them, wallets must synchronize them and exchanges must account for deposits arriving in the quicker sequence. The public network phase is where those connected systems can reveal compatibility problems before the new rules apply to transactions on Zcash mainnet.
Confirmation can come sooner, but services still set their own rules
With Zcash’s previous 75-second target, a transaction waited about 75 seconds on average for the next block and its first confirmation. NU7 cuts that average to about 25 seconds. For a merchant accepting ZEC, an exchange processing a deposit or a cross-chain service checking a transfer, the shorter delay can make a practical difference.
A first confirmation is not the point at which every service considers a payment final. Exchanges can require several blocks before crediting a customer, and merchants may apply stricter checks to larger payments. NU7 supplies confirmations more frequently; it does not replace the policies that decide when a transfer is complete.
The practical question is whether those services can process the additional blocks quickly enough for the shorter interval to reach the user. A faster protocol offers little improvement if a wallet syncs slowly or an exchange’s deposit system cannot follow the chain in real time.
Wallets, exchanges and miners face different checks
Exchanges need to scan new blocks, count confirmations and update balances without falling behind. Indexers and explorers need their transaction records to remain complete and timely as the chain advances more often.
Wallets face a different workload. Shielded Zcash transfers use cryptographic proofs, making private activity more demanding to synchronize than ordinary transparent transfers. NU7 places limits on shielded actions within each block, helping to bound the work that light wallets may need to perform under the new cadence.
Miners and node operators are adapting to changed block-template behaviour and Zebra’s updated state-database format. Software that reads node data directly must remain compatible too. Each of those components can work correctly on its own while still failing at the point where it meets another system, which is why a shared public network is useful before mainnet activation.
Faster blocks change timing, not Zcash’s supply schedule
More blocks in the same period could appear to mean more ZEC entering circulation. NU7 prevents that by reducing the reward attached to each scheduled block and extending the number of blocks between halvings. Zcash’s roughly four-year halving rhythm and its 21 million ZEC cap therefore remain in place.
That design follows the coinholder vote for 25-second blocks, which backed quicker confirmations while retaining the network’s existing issuance model. The change is about when transactions enter blocks, not about bringing future ZEC supply forward.
NU7 also changes the block-production rules in another way. Under the Network Sustainability Mechanism described by the Zcash Foundation, 60% of transaction fees enters a reserve for future mining rewards, while miners receive the remaining 40%. The same live run is therefore checking reward calculations and shielded-transaction limits alongside the shorter block interval.
NU7 is not Zcash’s entire privacy-scaling roadmap
Project Tachyon, Zcash’s longer-term work on recursive proofs and private-payment scalability, is not part of NU7. The work described in Zcash’s push for faster private payments remains under development and will require further implementation, security review and approval before it can change mainnet transactions. NU7 is closer to production: it improves the time to a new block while that broader effort continues.
November now depends on results from the live run
Before NU7 can move to mainnet, developers need to confirm that node implementations follow the same chain, wallets and exchanges can operate at the quicker pace, and no consensus or performance issue emerges. The proposed November 5 activation is a target, not a reason to ignore a fault found during this period.
The route to that decision was set out with the November 5 NU7 target. For users, the immediate development is simple: public-testnet transactions can now receive their first confirmation sooner. Whether that improvement reaches Zcash mainnet in November depends on the infrastructure holding up under the new rules.
This article is for informational purposes only and does not constitute investment advice. Network-upgrade dates and technical specifications may change during testing.
Kosta has reported on cryptocurrency markets and blockchain infrastructure since 2020, bringing over six years of hands-on experience in the crypto industry built through daily tracking of markets, trends, and emerging blockchain developments. Specializing in Bitcoin on-chain analysis, institutional ETF flows, and digital asset price action, his work at Coindoo has been cited by other news agencies and consistently covers market developments with a focus on data-driven reporting across Bitcoin, Ethereum, Solana, and XRP.
Over the years, Kosta has contributed to multiple crypto media outlets in different regions, authoring over 6,000 articles across the sector. His reporting spans cryptocurrency markets and the broader fintech industry, tracking not only price action but also the technological and regulatory forces shaping the ecosystem.
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