Nov 5, 2026, 12:47 a.m. EST
2 min read
Summary
- Zcash participants face a deadline until a network update anticipated for Thursday evening to transfer roughly $16 million out of Sprout, the blockchain’s earliest privacy pool, before those assets become impossible to spend, even for holders with correct private keys.
- Approximately 12,226 ZEC stayed inside Sprout as of Thursday morning, and funds left behind might never recover accessibility, although a subsequent network modification could potentially change that outcome.
- The NU7 protocol overhaul will deprecate Sprout’s legacy transaction architecture to minimize code complexity and vulnerability exposure, while simultaneously reducing the expected block interval from 75 seconds down to 25 seconds.
Zcash users have under twenty-four hours to shift approximately $16 million away from the platform’s inaugural privacy pool prior to an impending upgrade that will render all remaining funds permanently unspendable, regardless of whether holders retain their private keys.
Roughly 12,226 ZEC remained locked within the Sprout pool on Thursday morning, marking a decrease from roughly 22,263 one week prior, based on ZecStats’ historical records. The bulk of that withdrawal activity occurred Sunday, when around 9,094 ZEC departed. Only 40 ZEC followed on Wednesday.
The Zcash ecosystem allows participants to obscure transaction sender details, recipient identities, and transferred amounts. These confidential balances reside within shielded pools, functioning essentially as isolated network segments utilizing alternative generations of cryptographic privacy technology. Sprout debuted alongside the network back in October 2016 and has since been supplanted by advanced pools.
This cutoff coincides with NU7, a scheduled network enhancement targeting block 3,543,405.
The ledger reached block 3,542,391 at 05:24 UTC on Thursday, according to Blockchair statistics. Maintaining the current pacing of one block every 75 seconds, that left roughly 21 hours, placing deployment close to 9:30 p.m. ET on Thursday. The precise timestamp relies entirely on how rapidly miners discover blocks.
NU7 will officially reject version-4 transactions, representing the singular transaction framework capable of spending Sprout assets, according to ZIP 2003, the formal technical specification outlining the revision. Any capital still sitting inside the pool will lose all spendability under the updated protocol parameters.
Evaluated at $1,300 per ZEC, the residual balance equates to roughly $16 million, though extra withdrawals executed prior to activation will further diminish the total frozen quantity.
The public pool tally cannot identify individual holders nor determine how much capital belongs to dormant wallets with misplaced keys. Sprout addresses initiate with the prefix “zc,” offering an identifier to assist users reviewing legacy wallet archives in determining if this deadline impacts them.
The tokens will stay part of the aggregate Zcash circulating supply. ZIP 2003 maintains the possibility of restoring fund access via some future network revision, while cautioning that spending functionality might never be reinstated.
Maintaining active support for Sprout also incurs ongoing maintenance burdens. Its legacy transaction mechanisms introduce added complexity and security vulnerabilities into the software validating Zcash transfers, despite the pool’s minimal utilization rates, notes ZIP 2003.
Furthermore, NU7 decreases the standard interval between blocks from 75 seconds down to 25, accelerating anticipated waiting periods for transaction settlements.
Read More: Zcash developers confirm November date for upgrade that triples payment speed
Originally published at https://www.coindesk.com/tech/2026/11/05/zcash-is-about-to-freeze-usd16-million-in-its-oldest-privacy-pool.
