NU7 Network Upgrade Mainnet Activation

Zcash (ZEC) · Releases & Updates · November 6, 2026

Zcash activated Network Upgrade 7 (NU7) on mainnet at block 3,543,405 on November 6, 2026 (02:34 UTC, evening of Nov 5 in the US), cutting block times from 75 to 25 seconds.

Zcash, the privacy-focused proof-of-work cryptocurrency, activated Network Upgrade 7 (NU7) on mainnet at block height 3,543,405, mined at 02:34 UTC on November 6, 2026 (the evening of November 5 in US time zones). The NU7 hard fork cut block time from 75 seconds to 25 seconds, added the Network Sustainability Mechanism (NSM) with issuance smoothing, disabled v4 transactions and moved ahead with Sprout deprecation. NU7 followed the official timeline: code completion on September 30, testnet activation on October 6, and an October 20 go/no-go that locked in the mainnet activation height, shipped in Zebra 7.0.0. The scope was agreed by the Zcash Foundation, Project Tachyon, Valar Group, ZODL and Shielded Labs after a coinholder vote and a ZCAP poll. Most ZEC holders and wallet users did not need to take any action, but funds in Sprout addresses had to be moved before activation and node operators had to upgrade before the activation block.

Last verified: · Source: x.com

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