Zcash NU7 network upgrade freezes legacy Sprout privacy pool funds

CryptoVideos brief
Built from 3 sources 6 Nov 2026 · 18:26 UTC 1 min read Main editor: Earl Jacobson

The Zcash network activated the NU7 upgrade at block height 3,543,405. The upgrade disables version 4 transactions. This change leaves thousands of ZEC in the legacy Sprout shielded pool unspendable. The upgrade also changes the target time between blocks from 75 seconds to 25. It introduces a Network Sustainability Mechanism that removes 60% of transaction fees from circulation.

Key points

The NU7 network upgrade activated at block height 3,543,405.
Version 4 transactions are no longer supported under the new rules.
Funds remaining in the legacy Sprout shielded pool are currently unspendable.

Why it matters

The NU7 upgrade alters core network parameters and transaction rules for Zcash users, stranding legacy shielded funds while introducing new block time targets and fee handling mechanisms.

Price context · ZEC

At publication

$1,348.35

Now

$1,339.03

Change since

−0.69%

7 days · dashed line = publication

Sources · 3 publishers

Crypto Briefing Tier 2 First report 5 Nov, 05:54 UTC

Zcash to freeze $16M in its oldest privacy pool with NU7 upgrade

Cointelegraph Tier 1 09:00 UTC

Zcash NU7 upgrade goes live, leaves 12,224 ZEC stranded in Sprout pool

U.Today Tier 2 11:29 UTC

Zcash (ZEC) OI Down 7.8% as NU7 Upgrade Goes Live

Coverage timeline

Nov 5, 05:54First reported by Crypto Briefing
Nov 6, 09:00Also reported by Cointelegraph
Nov 6, 18:26CryptoVideos brief published

How this page is checked. AI drafted this brief from selected independent reports. Automated checks compare numbers, source coverage and topic terms, but may miss errors. Publication and evidence refreshes run automatically. Read the linked reports for context. Report an error