Zcash Founder Warns Orchard Bug Could Have Created Undetectable Counterfeit ZEC

TLDR: Security researcher Taylor Hornby discovered the Orchard circuit flaw on May 29, 2026, using Anthropic’s Opus 4.8 model. The bug allowed false elliptic curve multiplication inputs to pass verification, enabling unlimited counterfeit ZEC generation. Due to Orchard’s privacy design, there is no cryptographic proof whether the vulnerability was exploited before the fix. Shielded Labs [...]

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