Zcash completed an emergency upgrade to fix a critical Orchard privacy pool bug, with no funds lost or user privacy affected.
Altcoin News
Zcash has completed an emergency network upgrade after developers discovered and fixed a critical bug in Orchard, the network’s most advanced privacy pool.
The vulnerability affected Orchard’s zero-knowledge proof circuit and could have allowed invalid state transitions within the pool. The Zcash Foundation said there was no evidence that the bug was exploited, adding that no unauthorized value was created, and user privacy was not affected.
Source: Zcash Foundation
The issue was discovered on May 29 by independent security researcher Taylor Hornby during an audit for Shielded Labs. It was disclosed to Zcash Open Development Lab engineers, who confirmed the flaw and coordinated a confidential response with developers, miners, exchanges, and node operators.
Zcash Moves Through Two-Step Emergency Fix
The repair unfolded in two stages. First, Zebra 4.5.3 temporarily disabled Orchard actions to prevent the bug from being used while the permanent fix was prepared. Then, Zebra 5.0.0 activated the NU6.2 upgrade, restoring Orchard with a corrected circuit.
The process briefly caused confusion across the ecosystem. Some block explorers appeared to show that Zcash had stopped producing blocks, prompting speculation that the network was down. Community members and block explorers later said the chain had continued running, while explorers were affected by node upgrades and resyncing.
Zcash Open Development Lab-affiliated contributor Tatyana said the network experienced a brief period of instability as miners upgraded and converged on the new consensus rules. Stability was restored by around 7:00 am UTC on June 2.
ZODL founder Josh Swihart described the response as the “most ambitious network upgrade in Zcash’s history,” pointing to the number of parties involved and the short timeline.
Source: Josh Swihart
The disclosure did not appear to interrupt ZEC’s recent momentum. Zcash was trading near $605 after rising more than 10% over 24 hours, bringing its 30-day gain above 53%. The token remains far below its 2016 all-time high of $3,191.
Source: CoinMarketCap
Related Article: Zcash Surges 70% in 7 Days on Privacy Coin Demand
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