Zcash Activates NU7 Upgrade to Restructure Miner Emissions and Fees
Key Summary
Zcash mainnet activated the NU7 upgrade at block 3,543,405 early Tuesday morning, introducing the Network Sustainability Mechanism developed by Shielded Labs to recirculate 60% of transaction fees into a locked reserve until 2031. The protocol update simultaneously reduced block production times from 75 seconds to 25 seconds while deprecating legacy Sprout pool addresses. Market participants watched ZEC drop 5% during a broader crypto market sell-off that pushed Bitcoin down 9%.
Key Bullets
- Zcash activated the NU7 upgrade on its mainnet at block 3,543,405 to restructure network emission models and transaction fee allocations.
- The newly deployed Network Sustainability Mechanism redirects 60% of transaction fees into a locked reserve fund until the year 2031.
- Network block production speeds accelerated by 300% as validation intervals dropped from 75 seconds down to 25 seconds.
- Legacy Sprout pool addresses were permanently deprecated by the protocol upgrade, rendering unmigrated coins unredeemable.
NU7 Upgrade Goes Live on Mainnet
Zcash activated its long-awaited NU7 upgrade on the mainnet at block 3,543,405 during early morning trading hours. Public on-chain transaction records confirm the deployment introduces the Network Sustainability Mechanism engineered by Shielded Labs. The protocol adjustment alters long-term emission curves to address post-emission network security. Block production intervals dropped from 75 seconds to 25 seconds, accelerating chain throughput by 300% across validating nodes.
The newly integrated economic architecture allocates 60% of all transaction fees directly into the Network Sustainability Mechanism reserve fund. ZEC miners retain the remaining 40% of transaction fees alongside reduced block rewards. Funds directed into the reserve are cryptographically locked until 2031. After the lockup expires, accumulated reserves will replenish mining rewards as block subsidies decline.
Legacy Pools Deprecated and Fees Recirculated
Protocol rules enforced by the NU7 upgrade invalidate old transaction types, rendering legacy coins housed within the Sprout shielding pools permanently unredeemable. Shielded Labs abandoned initial proposals to entirely eliminate halvings in favor of a flat issuance curve following pushback from large token holders. Developers instead implemented ZIP 237 to preserve community consensus. Founder Zooko Wilcox acknowledged the network milestone publicly through social channels shortly after block validation completed.
The controversial Zcash Community Grant program received an allocation of 50,000 ZEC to support ongoing ecosystem development under the new framework. Exchange order-book depth monitored during the activation showed ZEC trading down 5% during a broader market sell-off that dragged Bitcoin lower by 9%. Venture investor Chris Burniske noted via public commentary that the ZEC/BTC ratio remains a key indicator for valuation shifts. Taiki Maeda stated expectations for ZEC to target 2% of Bitcoin market capitalization by the end of the year.
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