On-chain data has confirmed that the Zcash network is down, it has not produced a block in over 4 hours, a catastrophic deviation from the protocol’s 2.5 minute block goal that has left thousands of transactions stuck in the memory pool without any confirmation.
JUST IN: Zcash is reportedly down after failing to produce a block in the last 4 hours, according to InfinityHedge. pic.twitter.com/KdijaSlbCQ
– Coin Bureau (@coinbureau) June 3, 2026
JUST IN: Zcash is reportedly down after failing to produce a block in the last 4 hours, according to InfinityHedge. ZEC fell 2% in the hour following the four-hour shutdown, with exchange deposit services on Binance and Kraken effectively frozen as no block confirmations were 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 shutdown
Block explorers monitoring the Zcash chain confirm that the shutdown is real and lasting. In normal operation, the network targets a new block every 2.5 minutes via its Equihash proof-of-work consensus, and those four hours of silence likely resulted in 96 missed blocks.
Community developers active on the Zcash Foundation and Electric Coin Co. (ECC) forums have been circulating two main theories: a consensus bug triggered by a recent minor node update, or an unanticipated interaction with the network’s difficulty adjustment algorithm.
For now, a standard 51% attack has been largely ruled out, as the signature here is a complete shutdown of block production, not a reorganization of the chain.
INTEL: Zcash coordinated a network upgrade due to an Orchard pool robustness vulnerability.
Several block explorers, including the official explorer, still seem to be catching up after the upgrade, while block production is said to continue, as seen on ZecMiningPool.
We… pic.twitter.com/eW3tJNz6Tf
– Solid Intel
(@solidintel_x) June 3, 2026What the data does NOT yet confirm is the precise block height at which production stopped, whether the shutdown simultaneously affects Zcashd and ECC’s Zebra client, or whether a patch is imminent.
This isn’t the first time Zcash’s dual-client architecture has created stress at the consensus layer: in early June 2026, an emergency Zebra consensus patch was needed to prevent a network split, and a separate emergency Orchard upgrade temporarily suspended protected private transactions to address a pool vulnerability.
The rapid-response emergency patch model becomes a feature rather than an anomaly. Until ECC or the Zcash Foundation releases an official post-mortem, the cause remains in an uncomfortable gray area. Miners are clearly not producing. The reason remains unconfirmed.
ZEC Price Falls as Grid Outage Triggers Loss of Confidence
ZEC was trading in a range about 2% lower than an hour ago, with selling pressure accelerating precisely as the blockchain’s four-hour shutdown became evident to all market participants. The move mirrors the pattern seen in other network disruption events, a slow initial response, then a sharp decline once duration makes denial impossible.
ZEC has seen an extraordinary recovery from its July 2024 low below the dollar, surging more than 16 times to reach the $250 range in April 2026, with a 16% single-day peak to $372 recorded on April 9, 2026, and another sharp 30% move in May that put the coin above $600.
The structural reading is bearish until block production resumes and an official explanation confirms that the halt is contained.
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The article Zcash Down: No Blocks Produced in 4 Hours appeared first on Cryptonews.
