Winklevoss-owned Gemini switches Zcash software ahead of faster 25-second blocks
Reported by CoinDesk · AI-assisted summary by ChikoCorp AI News Desk
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Summary
Gemini, owned by Cameron and Tyler Winklevoss, switched its Zcash node software from Zebra to Zakura, reducing synchronization time from nearly a day to just over six hours. This change precedes Zcash's planned NU7 upgrade, which will reduce block times from 75 to 25 seconds, requiring nodes to process transactions three times as often. Gemini has not yet published performance tests of Zakura under the new faster block schedule.
Why it matters
The source explains that since exchanges must verify incoming ZEC transactions before crediting user accounts, faster node synchronization reduces downtime for deposits and withdrawals. With Zcash's block time shortening under NU7, nodes will need to keep pace with more frequent updates, making efficient synchronization software crucial for maintaining seamless exchange operations.
Key context
Zcash is undergoing a network upgrade (NU7) targeted for November 5, 2026, which will cut block times from 75 seconds to 25 seconds. Running a Zcash node requires software that verifies transaction history; Gemini previously used Zebra but switched to Zakura, which offers significantly faster catch-up times and can use saved snapshots to accelerate syncing. The Winklevosses have wider Zcash interests, including mining investments through Cypherpunk Technologies.
Key numbers and entities
Gemini exchange (GEMI), Cameron and Tyler Winklevoss, Zcash (ZEC), Zebra software, Zakura software, Cypherpunk Technologies ($59 million financing, $33 million mining fleet sale), NU7 network upgrade, targeted mainnet upgrade November 5, 2026.
What remains unclear
The source does not provide verified performance data of Zakura operating under the NU7 upgrade’s faster 25-second block schedule. It also lacks detailed information on whether other Zcash network participants will adopt Zakura or the broader impact on network security and user experience.