Zcash’s shielded supply achieved a new all-time high of 5.1 million ZEC on June 3, 2026, even as the network experienced a temporary block production halt. The milestone, reported by community dashboard OnlyZec, indicates that a growing number of holders are moving funds into Zcash’s shielded addresses, where zero-knowledge proofs encrypt sender, receiver, and amount details. This voluntary shift underscores sustained adoption of the privacy-focused protocol’s core functionality.
The record comes against a backdrop of heightened regulatory scrutiny on privacy-preserving technologies globally. A rising shielded supply ratio is a key on-chain metric for Zcash, directly measuring real-world privacy usage beyond mere availability. However, the broader data does not reveal how many unique users hold shielded ZEC or whether concentration risk exists.
Simultaneously, on-chain data confirmed that the Zcash network stopped producing blocks for over four hours, a severe deviation from its 2.5-minute block target. Over 96 blocks were missed, leaving transactions stranded in the mempool. ZEC price dropped roughly 2% as the halt became apparent, with major exchange deposit services frozen. Initial theories pointed to a consensus bug or mining coordination failure, but a 51% attack was ruled out due to the nature of the halt.
Shortly after, a tweet from Solid Intel stated that Zcash had coordinated a network upgrade to address an Orchard pool soundness vulnerability. Block explorers, including the official one, were catching up after the upgrade, and block production reportedly resumed through pools like ZecMiningPool. This emergency upgrade follows a pattern of rapid-response patches from the Electric Coin Co. (ECC) and Zcash Foundation, including a June 2026 Zebra consensus patch and a separate Emergency Orchard Upgrade that temporarily disabled shielded transactions.
The convergence of a shielded supply milestone with a network disruption highlights the protocol’s dual reality: growing privacy adoption but ongoing technical challenges. An official post-mortem from ECC or the Zcash Foundation is yet to be released.
