Zcash to Freeze About $16 Million in Oldest Sprout Privacy Pool Under NU7
Zcash's NU7 network upgrade, scheduled for around November 5-6, 2026, will disable the transaction type needed to spend from its original Sprout shielded pool. About 12,226 ZEC, roughly $16 million at recent prices, remains there and cannot be recovered afterward under current design.
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What NU7 Changes
The NU7 network upgrade disables version 4 transactions, the only transaction type that can reach the Sprout shielded pool, which Zcash launched in 2016. Activation is scheduled around November 5-6, 2026, at block height 3,543,405. Coins left in Sprout after that block will remain counted in total supply but cannot be transacted.
Sprout currently holds approximately 12,226 ZEC. At recent prices of roughly $1,300 to $1,320 per ZEC, that balance is worth about $16 million. The newer Sapling, Orchard, and Ironwood shielded pools are not affected by NU7 and will continue to operate normally.
Migration Window and Balance Trends
The Sprout balance has fallen sharply in recent weeks. Crypto Briefing reported the pool held roughly 22,300 ZEC in mid-October, while CoinDesk reported that roughly 10,000 coins left the pool over the past week, with about 40 moving out on Wednesday alone. The two outlets measure the drawdown over different windows, so their figures describe the same trend rather than a single conflicting number.
The practical remedy for holders is to move Sprout funds into a supported wallet before activation. Sprout has been limited to withdrawals only for several years, so funds can leave the pool but no new deposits can enter it. Once NU7 is live, Crypto Briefing reports there is currently no mechanism to recover stranded funds.
Market Implications
Because the stranded ZEC stays in total supply, the effect on circulating supply is a question of how many holders migrate in time. Crypto Briefing argues that a large unmoved balance could create a temporary liquidity squeeze that weighs on sentiment, though neither source quantifies that effect. The most exposed group appears to be early users who shielded coins years ago and have not revisited their wallets since.
Several open questions remain. Observers will be watching the Sprout balance as November approaches, whether wallet providers simplify migration, and whether any recovery mechanism is proposed later. As of the reporting, none has been announced.
Why It Matters
For Traders
Sprout balances are draining quickly, so watch whether the remaining roughly 12,226 ZEC moves before the November activation window closes.
For Investors
Freezing a legacy privacy pool signals Zcash is willing to retire early protocol designs, a modernization pattern that shapes long-term supply expectations.
For Builders
Any wallet or service still supporting version 4 Sprout transactions needs a migration path in place before block 3,543,405 or users lose access.
This article is for information only and is not financial advice. Read the full disclaimer.
