On-chain data confirmed that the Zcash network is down, it has been producing no blocks for over 4 hours, a catastrophic deviation from the protocol’s 2.5-minute block target that left thousands of transactions stranded in the mempool with zero confirmations.
JUST IN: Zcash reportedly down after failing to produce any block in the past 4 hours, per InfinityHedge. pic.twitter.com/KdijaSlbCQ
— Coin Bureau (@coinbureau) June 3, 2026
ZEC dropped 2% in the hour following the four-hour mark of the halt, with exchange deposit services on Binance and Kraken effectively frozen as no block confirmations cleared. This could be a consensus bug, a mining coordination failure, or something uglier has not been confirmed.
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Zcash Down: Blockchain Halt
Block explorers monitoring the Zcash chain confirm the halt is real and sustained. Under normal operation, the network targets a new block every 2.5 minutes via its Equihash proof-of-work consensus, and these four hours of silence have likely brought 96 missed blocks.
Community developers active on the Zcash Foundation and Electric Coin Co. (ECC) forums have circulated two primary theories: a consensus bug triggered by a recent minor node update, or an unforeseen interaction with the network’s difficulty adjustment algorithm.
As of now, a standard 51% attack has been largely ruled out as the signature here is total cessation of block production, and not chain reorganization.
INTEL: Zcash coordinated a network upgrade due to an Orchard pool soundness vulnerability.
Multiple block explorers, including the official explorer, still appear to be catching up after the upgrade, while block production is reportedly continuing, as seen on ZecMiningPool.
We… https://t.co/743lwfwqJ7 pic.twitter.com/eW3tJNz6Tf— Solid Intel
(@solidintel_x) June 3, 2026
What the data does NOT yet confirm is the precise block height at which production stopped, if the halt is affecting both Zcashd and ECC’s Zebra client simultaneously, or if a hotfix is imminent.
This is not the first time Zcash’s dual-client architecture has created consensus-layer stress, in early June 2026, an emergency Zebra consensus patch was required to prevent a network split, and a separate Emergency Orchard Upgrade temporarily paused shielded private transactions to address a pool vulnerability.
The pattern of rapid-response emergency patches is becoming a feature rather than an anomaly. Until ECC or the Zcash Foundation issues an official post-mortem, the cause sits in an uncomfortable grey zone. Miners are clearly not producing. The reason why remains unconfirmed.
ZEC Price Slides as Network Outage Triggers Confidence Selloff
ZEC was trading in the range of around 2% lower from an hour ago, with selling pressure accelerating precisely as the four-hour mark of the blockchain halt became apparent to broader market participants. The move mirrors the pattern seen across other network disruption events, slow initial reaction, then a sharp leg down once the duration makes denial impossible.
Zcash (ZEC)24h7d30d1yAll time
ZEC had staged an extraordinary recovery from its July 2024 lows under a dollar, surging over 16x to the $250 range by April 2026, with a 16% single-day spike to $372 recorded on April 9, 2026, and another sharp 30% move in May that put the coin at above $600.
The structural read is bearish until block production resumes and an official explanation confirms the halt is contained.
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The post Zcash Down: No Blocks Produced in 4 Hours appeared first on Cryptonews.
