Ironwood retires the Orchard pool, forcing migration of all existing coins to the new pool, which previously held about 3.66 million ZEC worth roughly $1.7 billion.

Formal verification work, including AI-assisted analysis, aims to exclude unconstrained cryptographic operations and to provide a quantum-recoverable feature under ZIP 2005 for a potential future recovery if cryptography is compromised.

A vulnerability in Orchard’s elliptic-curve scalar multiplication within Halo 2 could have enabled counterfeit notes; there is no evidence of exploitation, but confidence in Orchard’s privacy was undermined.

exchanges may pause deposits or withdrawals during migration, which signals exchange readiness rather than a Zcash failure.

Public warnings from Nym emphasize precaution against scammers posing as Ironwood migration support during the transition.

The upgrade introduces a turnstile accounting system and quantum-resistant transaction records to tighten control over circulating supply and mitigate future security risks.

The Zcash Ironwood upgrade launched at block height 3,428,143, introducing a new shielded pool named Ironwood to replace the older Orchard pool.

At activation, Ironwood locks the largest private pool, with roughly 3.76 million ZEC (about $1.89 billion, ~22% of circulating supply), and it allows only withdrawals from the old pool while new transactions occur in Ironwood.

The move follows a May vulnerability discovery that could have allowed counterfeit ZEC, with an emergency patch issued in June and a market selloff driven by uncertainty.

As of the report, ZEC traded around $506, reflecting a mixed market backdrop amid a broader price rally that helped Zcash earn a spot on Forbes’ 2026 top crypto list.

The turnstile ensures withdrawals from the shielded pool do not exceed verifiable deposits, preventing exit of potentially counterfeit coins.

Ironwood’s ultimate success hinges on smooth Orchard-to-Ironwood migrations, sustained privacy, and whether formal methods and public turnstile accounting bolster confidence in private digital money without compromising secrecy.