Zcash Edges Closer to Trust Restored with Ironwood Upgrade Progress

Zcash has been on a rough ride since the discovery of a critical vulnerability in its Orchard shielded pool, which sent ZEC plummeting over 50% to around $300.

The vulnerability, discovered and patched between May and June 2026, created a scenario where an attacker could theoretically mint unlimited ZEC inside the shielded pool without anyone being able to detect it.

Zcash founder Zooko Wilcox has announced that work on the Ironwood upgrade is nearly complete. The upgrade includes activated turnstile mechanisms and pool isolation, which allow users to validate the total supply without needing to see individual transaction details.

Project Tachyon, a team working under the Shielded Labs umbrella, is tasked with mathematically proving that the zk-SNARK circuits underpinning Ironwood's shielded pool cannot produce the class of counterfeiting bug that plagued Orchard. Formal verification produces a machine-checkable proof, the cryptographic equivalent of a mathematical theorem.

The completion of this proof would formally verify that the shielded pool's zk-SNARK circuits are free from the class of bugs that made undetectable counterfeiting theoretically possible.