Zcash completes its most complex network upgrade in history, fixing a critical vulnerability in Orchard's privacy pool.

CoinFeed reported on June 3rd that, according to Decrypt, the Zcash Foundation disclosed that on May 29th, security researcher Taylor Hornby discovered a critical vulnerability in the Zcash Orchard privacy pool circuitry, theoretically enabling double-spending. The Zcash Open Development Lab and the Foundation implemented a two-phase emergency plan within five days: first, a temporary soft fork to freeze all Orchard transactions; then, a hard fork named NU6.2 to upgrade and fix the zero-knowledge proof verification key and restore functionality. The team stated that the built-in "turnstile" mechanism showed no signs of over-issuance or attack, and blocks were continuously being produced normally on the chain, with only the block explorer briefly unable to read the chain during node upgrades. The official team urged nodes to immediately upgrade to Zebra 5.0.0.