Gemini, the crypto exchange owned by Cameron and Tyler Winklevoss, has replaced its Zcash software with new Zakura nodes. In deployments at the exchange, those nodes caught up with the Zcash network in just over six hours. The previous Zcash software took close to a day to sync under the same conditions.
From nearly a day to six hours
The sync time is a measure of how long a node takes to download and verify the entire Zcash blockchain from scratch. For an exchange, that matters because a node that's behind the network can't reliably process deposits and withdrawals. When Gemini's older software was running, catching up took close to 24 hours. With Zakura, that window shrinks to roughly six. The improvement isn't a minor tweak; it's a fourfold reduction in the time it takes to get a node operational.
Gemini hasn't said how many Zcash nodes it runs or whether the switch was prompted by a specific incident. The exchange also hasn't detailed what happens to sync times as the Zcash chain grows. For now, the only numbers on the table come from Gemini's own deployments: just over six hours with Zakura, close to a day without it.
Why Zcash is moving to 25-second blocks
The Zcash network is in the middle of a broader shift toward faster block times — specifically, 25-second blocks. Right now, Zcash blocks arrive less frequently, which means transactions can take longer to confirm. Shortening the block interval is meant to make the chain feel more responsive for everyday payments and exchange settlements.
But faster blocks put pressure on node software. More blocks per hour means more data to process and more chances for a node to fall behind. That's where Zakura comes in. The new node software is designed to keep up with a quicker chain without demanding a full day of catch-up when something goes wrong. Gemini's adoption is an early sign that at least one major exchange sees Zakura as production-ready.
What the switch means for Zcash users on Gemini
For everyday users, the change is mostly invisible. Deposits and withdrawals should continue as normal. The difference shows up when things break — during network upgrades, congestion, or a node restart. In those moments, Gemini's ability to resync in six hours instead of a day could mean shorter windows when Zcash services are limited.
It also reduces the operational drag on Gemini's team. A node that takes a day to sync ties up staff and infrastructure for a full cycle. Cutting that to six hours frees up resources for other assets and other problems. Whether other exchanges follow Gemini's lead isn't clear yet. The Winklevoss-owned exchange is among the first to publicly disclose a Zakura deployment.
Zcash's push toward 25-second blocks is still in progress, and node software will have to keep pace. Zakura's performance at Gemini is one data point, not a guarantee. The real test comes when the Zcash network actually operates at 25-second intervals — a scenario that will stress every node, including Zakura. Gemini hasn't said whether it will publish ongoing sync-time metrics or share results from future upgrades.
For now, the exchange has confirmed a simple fact: its new nodes are faster to bring online. The next milestone is the 25-second block change itself, and no firm date has been announced for when that will go live on the Zcash mainnet.
