Zcash targets November for NU7 mainnet upgrade with 25-second blocks

NU7 will cut Zcash block times to 25 seconds and preserve its halving schedule, with testnet activation planned for Oct. 6.

Zcash developers are targeting Nov. 5 for NU7 mainnet activation after organizations and engineering teams reached “unanimous agreement” on its contents and estimated timeline. 

On Thursday, Zcash developer Sean Bowe said the upgrade is scheduled to activate on the testnet on Oct. 6. A final decision on the mainnet upgrade and its activation height is scheduled for Oct. 20, after an assessment of NU7’s testnet performance. 

The upgrade would reduce Zcash’s target block spacing from 75 seconds to 25 seconds, disabling version 4 transactions and integrating the Network Sustainability Mechanism (NSM). The chosen NSM configuration would preserve Zcash’s halving schedule, with the reintroduction of previously removed supply beginning in February 2031. 

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