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Zcash tests 25-second blocks on Oct. 6 ahead of an Oct. 20 mainnet call
Zcash's NU7 upgrade goes to testnet on Oct. 6, cutting target block time from 75 to 25 seconds with daily ZEC issuance held roughly flat. Nothing changes this month on the chain carrying real ZEC, so the token's October price trades on a test result and a scheduling call.
The Investor · Invest desk
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What happened
- A development-team timeline puts the mainnet go or no-go decision on October 20 and targets November 5, and the official upgrade page has not yet set a mainnet activation height.
- The Zcash Foundation's Zebra 7.0.0-rc.0 release on October 2 set testnet activation at height 4,465,026, and testnet operators must upgrade to stay on that chain.
- ZEC crossed $1,000 early in September, traded near $1,200 on September 7 and passed $1,650 on September 23.
- By October 4 the token traded between about $1,300 and $1,340 after losing roughly 19% over seven days.
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Why it matters
- constraint With daily issuance held flat, NU7 leaves holders' dilution rate where it is, so any value case for faster blocks has to rest on more use of the chain.
- decision The October 20 call commits a mainnet height on two weeks of test-chain evidence, leaving 16 days before the November 5 target.
- capability The Network Sustainability Mechanism lets part of transaction fees fund future block rewards, the only listed NU7 change to how miner pay is sourced.
Tripling the block count while daily issuance stays put [5] cuts each block's reward to roughly a third of today's [1]. A day of 86,400 seconds holds 1,152 blocks at 75-second spacing and 3,456 at 25 seconds [3][1]. Miners collect the same daily total in smaller pieces [1].
Users get faster confirmation. The crypto.news review of the Foundation release and the developers' timeline points out that a forecast shift in how blocks are produced does not, on its own, prove that wallets, exchanges or users will bring more economic activity to the chain [10]. On the chain that carries real ZEC, that activity cannot start before November [11].
The market pricing that prospect is liquid. CoinGecko's October 4 snapshot showed about $540 million of daily volume against a market value near $22.7 billion [7]. Roughly 2.4% of the token's value changed hands in a day [3], and the same figures imply about 17 million ZEC outstanding [2]. From the $1,330 reference crypto.news used, getting back to $1,650 takes a 24.1% gain, and a slide to $1,100 a 17.3% loss [13]. The publication notes that those percentages describe the path from one dated reference, not the odds of either outcome [14].
October has three plausible versions. The test runs cleanly, a height is agreed on October 20, and the November 5 target holds [4]. The test turns up problems and the decision slips, taking the November date with it; earlier coverage described that target as conditional on testing [9]. Or the test runs cleanly and ZEC keeps trading on the same buying and selling that drove September [12].
I think the third version fits the evidence best. The seven-day drop to October 4 happened before the test chain reached the upgrade, so it was not a verdict on the test [1][6]. A clean run leaves the earliest mainnet date at November 5 [4], and what it removes for a holder is the risk of delay. crypto.news puts more weight on the test: it writes that a recovery depends on what buyers do before the upgrade is live, and that a failed test or another round of selling could deepen the retreat [15]. The view is wrong if a clean run and an agreed height on October 20 carry ZEC back toward $1,650 on no other news.
What to watch
- Whether public testnet passes height 4,465,026 around October 6 with operators on Zebra 7.0.0-rc.0 and no reported faults.
- Whether the October 20 decision assigns a mainnet activation height and keeps November 5 as the target.