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Zcash fixes critical Orchard bug with emergency soft fork and urges urgent node upgrades.

Protocol Fundamentals
03 Jun 2026
Crypto news
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Neutral
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Zcash Foundation discovered and fixed a critical bug in the Orchard shielded pool's zero-knowledge proof circuit that could have allowed invalid state changes and double spending. An emergency soft fork disabled Orchard actions temporarily, followed by a hard fork (NU6.2) that re-enabled them with a corrected circuit and new verifying key. The total ZEC supply remained secure with no unauthorized creation detected. Node operators are strongly urged to upgrade to Zebra 5.0.0 to maintain network security and functionality.

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