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Zcash says Ironwood proof rules out undetectable counterfeiting bugs

Zcash researchers have completed formal verification of Ironwood, a new shielded pool introduced via the NU6.3 upgrade. They published a machine-checked proof, written in Lean and comprising over 2,700 theorems, that establishes the pool's "balance integrity." This proof confirms that, under its cryptographic assumptions, Ironwood cannot contain undetectable counterfeiting bugs, ensuring it cannot pay out more value than has publicly entered it. The verification, which took multiple teams over a month, covers the zero-knowledge proof system, circuit rules, and ledger accounting but not Ironwood's separate privacy guarantees. Ironwood was created in response to a theoretical vulnerability in the older Orchard pool that could have allowed undetectable counterfeiting, though there's no evidence of exploitation. Funds migrating from Orchard must pass through a public "turnstile" checkpoint, designed to prevent any hypothetical excess coins from entering the new pool and to provide evidence on whether the old pool was exploited.

cointelegraph07/29 01:15

Zcash says Ironwood proof rules out undetectable counterfeiting bugs

cointelegraph07/29 01:15

Zcash Bug Could Have Minted Unlimited ZEC Undetected

A critical vulnerability in Zcash's Orchard shielded pool, discovered by researcher Taylor Hornby on May 29, 2026, could have allowed an attacker to create an unlimited amount of undetectable counterfeit ZEC. The flaw, involving an under-constrained element in the Orchard circuit, existed from the pool's 2022 activation until an emergency fix was deployed by June 2, 2026. Hornby identified the bug using AI-assisted auditing tools and confirmed its exploitability in a test environment. Due to Orchard's privacy features, which hide transaction amounts and history, there is no cryptographic way to prove whether the vulnerability was exploited before the fix. While Shielded Labs assesses prior exploitation as unlikely, this uncertainty has sparked a debate on proving supply integrity in privacy-preserving systems. In response, Shielded Labs and other developers are exploring a network upgrade, potentially involving a new shielded pool and formal verification of the circuit rules to prevent future vulnerabilities and allow verification of the ZEC supply's integrity. ZEC's price fell nearly 45% following the disclosure.

bitcoinist06/05 12:31

Zcash Bug Could Have Minted Unlimited ZEC Undetected

bitcoinist06/05 12:31

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